JP3794293B2 - Stereoscopic image forming apparatus and stereoscopic image forming method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stereoscopic image forming apparatus and a stereoscopic image forming method, and in particular, it is possible to accurately align a lens and a parallax image, to produce a high-definition stereoscopic image sheet, and to increase the size of the stereoscopic image sheet. The present invention relates to a three-dimensional image forming apparatus that can be used and a three-dimensional image forming method using the same.
[0002]
[Prior art]
Conventionally, a parallax image recorded on the back side of a lenticular sheet in which a plurality of images taken from a plurality of directions are combined in a stripe shape as a stereoscopic image and a plurality of columnar aspherical lenses are arranged on the front surface Stereoscopic images that are stereoscopically viewed by passing through the columnar aspherical lens of the lenticular sheet from the surface side of the lenticular sheet and observing with the left and right eyes are widely known.
In addition to the above three-dimensional image, there is also a three-dimensional image obtained by using a technique called integral photography using a plurality of convex lenses arranged in a planar shape (eyelet lens).
[0003]
These three-dimensional images are obtained by recording parallax images at positions corresponding to each of a plurality of lenses composed of columnar aspherical lenses or eyelet lenses, and have different colors for both eyes. It has the advantage that it is not necessary to see through special glasses such as spectacles.
As a method for forming such a stereoscopic image, for example, a technique of recording a parallax image with an ink jet printer on the back surface of a lenticular sheet has been proposed.
[0004]
[Problems to be solved by the invention]
Conventionally, in such a stereoscopic image, in order to obtain a high-definition image, it has been required to accurately align the lens and the parallax image observed through the lens.
As a technique corresponding to this requirement, a detection means for detecting a relative position between the lenticular sheet and the means for transferring or printing at a position where the lenticular sheet is attracted to the means for transferring or printing, and an output signal of the detection means. Accordingly, there has been proposed a stereoscopic image forming apparatus (Japanese Patent Laid-Open No. Hei 8-22091) having a position control means for controlling a relative position with respect to a means for transferring or printing.
[0005]
However, even in the conventional stereoscopic image forming apparatus described above, the alignment accuracy between the lens and the parallax image is insufficient, and in order to obtain a higher definition image, the alignment accuracy between the lens and the parallax image is further increased. It is required to increase.
In addition, when the stereoscopic image sheet is enlarged, since the displacement of the recording position of the parallax image due to the expansion and contraction of the lenticular sheet and the mechanism of the ink jet printer increases, it becomes more difficult to align the lens and the parallax image. There is a problem in that the parallax image when stereoscopically viewed is not uniform and the shift due to the viewing position becomes large.
[0006]
The present invention has been made in view of the problems of the above-described conventional technology, and can accurately align a lens and a parallax image, can produce a high-definition stereoscopic image sheet, and can also produce a stereoscopic image. It is an object of the present invention to provide a stereoscopic image forming apparatus that can cope with an increase in the size of a sheet.
Another object of the present invention is to provide a stereoscopic image forming method using the stereoscopic image forming apparatus.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following configuration.
The stereoscopic image forming apparatus according to the present invention creates a stereoscopic image sheet by recording a parallax image at a position corresponding to each of the plurality of lenses on the back surface of the lens sheet having a plurality of lenses arranged on the front surface. A recording apparatus that records the parallax image by ejecting ink to a predetermined position on the back surface of the lens sheet while moving in the main scanning direction with respect to the lens sheet; and Recording head moving means for moving in the scanning direction, detection head for detecting the relative position of each lens with respect to the recording head while moving in the main scanning direction, and detection head moving means for moving the detection head in the main scanning direction And the recording position of the parallax image with respect to each lens according to the lens position information detected by the detection head. An ink ejection position correcting unit that corrects a position at which the recording head ejects ink so that the recording head is positioned, and a sheet moving unit that moves the lens sheet in the sub-scanning direction with respect to the recording head and the detection head. At least.
[0008]
In such a stereoscopic image forming apparatus, when a stereoscopic image sheet is produced by recording a parallax image on the back surface of the lens sheet, first, the lens sheet is sub-scanned with respect to the recording head and the detection head by the sheet moving unit. The position for recording the parallax image in the sub-scanning direction with respect to the recording head and the detection head on the back surface of the lens sheet is adjusted. Next, the recording head is moved in the main scanning direction by the recording head moving means, and the detection head is moved in the main scanning direction by the detection head moving means. At this time, the detection head detects the relative position of each lens with respect to the recording head while moving in the main scanning direction, and the ink ejection position correction means detects the parallax image for each lens according to the lens position information detected by the detection head. The back surface of the lens sheet is the position corrected by the ink discharge position correcting means by discharging the ink so that the recording head discharges the ink so that the recording position becomes a predetermined position. A parallax image is recorded at a predetermined position.
[0009]
After that, the lens sheet is moved again in the sub scanning direction with respect to the recording head and the detection head by the sheet moving means, and the position where the parallax image in the sub scanning direction with respect to the recording head and the detection head is recorded on the back surface of the lens sheet is parallaxed. A parallax image is recorded in the same manner as described above in accordance with a position where no image is recorded. Further, similarly to the above, a stereoscopic image sheet is produced by repeating the movement of the lens sheet in the sub-scanning direction and the recording of the parallax image until the entire parallax image is recorded on the lens sheet.
[0010]
As described above, in the above-described stereoscopic image forming apparatus, the recording head is moved in the main scanning direction by the recording head moving unit, and the detection head is moved in the main scanning direction by the detection head moving unit. And the detection of the relative position of each lens with respect to the recording head by the detection head and the correction of the position at which the recording head discharges the ink by the ink discharge position correcting means can proceed simultaneously. For each corresponding parallax image, recording can be performed while aligning the lens and the position where the parallax image is recorded.
[0011]
Therefore, compared with the case where the lens and the parallax image are aligned by detecting the relative position between the lens sheet and the stereoscopic image forming apparatus, the alignment can be performed with very high accuracy.
Accordingly, the positional deviation between the lens and the parallax image due to the error in inserting the lens sheet into the stereoscopic image forming apparatus, the error due to the movement of the lens sheet by the sheet moving unit, and the error due to the expansion / contraction of the lens sheet is reduced. In addition, a high-definition stereoscopic image sheet can be produced and the size of the stereoscopic image sheet can be increased.
[0012]
Further, according to the above-described stereoscopic image forming apparatus, even if there is a portion where the lenses are not provided at a predetermined interval (pitch) on the lens sheet on which the parallax image is recorded due to a manufacturing error of the lens sheet. The recording head is moved in the main scanning direction by the recording head moving means, the parallax image is recorded by the recording head, the relative position of each lens with respect to the recording head is detected by the detection head, and the recording head by the ink discharge position correcting means is By simultaneously correcting the position of ejecting ink, the parallax image can be recorded while aligning the lens and the position where the parallax image is recorded for each parallax image corresponding to each lens. The parallax image can be accurately aligned.
As described above, since the above-described stereoscopic image forming apparatus can accurately align the lens and the parallax image, a stereoscopic image sheet can be produced with a high yield.
[0013]
In the above three-dimensional image forming apparatus, the recording head and the detection head are installed on the same support member, and a support member moving unit that moves the support member in the main scanning direction is provided. It is desirable that the support member moving unit also serves as the recording head moving unit and the detection head moving unit.
[0014]
By using such a three-dimensional image forming apparatus, when a three-dimensional image sheet is produced, the recording head and the detection head are moved together while being installed on the support member. For this reason, the error in the lens position information detected by the detection head becomes small, and the detection accuracy of the relative position of each lens with respect to the recording head by the detection head and the correction accuracy by the ink ejection position correction means are further improved. The accuracy of alignment between the lens and the parallax image can be improved.
In addition, since the support member moving means serves as both the recording head moving means and the detection head moving means, the stereoscopic image forming apparatus is configured as compared with the case where the recording head moving means and the detection head moving means are provided separately. The number of members to be reduced can be reduced, and the manufacturing process can be simplified and the three-dimensional image forming apparatus can be reduced in size and weight.
[0015]
In the stereoscopic image forming apparatus, it is desirable that both the recording head and the detection head are disposed on the back side of the lens sheet.
For example, the detection head is arranged on the front side of the lens sheet, the recording head is arranged on the back side of the lens sheet, and the relative position of each lens with respect to the recording head is detected by the detection head from the front side of the lens sheet. The parallax image may be recorded from the back side of the recording medium by the recording head.
[0016]
When both the recording head and the detection head are arranged on the back surface side of the lens sheet, the recording head and the detection head are compared with the case where the recording head and the detection head are separately arranged on the front surface side and the back surface side. The structure of the attachment portion of the head to the stereoscopic image forming apparatus can be simplified, and the manufacturing process can be simplified. Further, the space for arranging the recording head and the detection head can be reduced, and the stereoscopic image forming apparatus can be reduced in size and weight.
Further, when both the recording head and the detection head are arranged on the back side of the lens sheet, the surface on which the detection head detects lens position information and the surface on which the recording head records a parallax image are both on the back side of the lens sheet. Therefore, the error in the lens position information detected by the detection head is reduced, and the detection accuracy of the relative position of each lens with respect to the recording head by the detection head and the correction accuracy by the ink discharge position correction means are further improved. In addition, the accuracy of alignment between the lens and the parallax image can be improved.
[0017]
In addition, as a lens sheet used in the above-described stereoscopic image forming apparatus, there are cases where each lens is an eyelet lens or a lenticular lens.
Furthermore, as a configuration of the stereoscopic image forming apparatus corresponding to the case where the lens is a lenticular lens, the main scanning direction is the longitudinal direction of the lenticular lens, and the main scanning direction is the width direction of the lenticular lens You could think so.
[0018]
In the above three-dimensional image forming apparatus, when the lens is a lenticular lens and the main scanning direction is the longitudinal direction of the lenticular lens, the detection head is arranged in the longitudinal direction of the lenticular lens during main scanning. In addition, the relative position in the width direction of each lenticular lens is detected, and the ink ejection position correction means corrects the ink ejection position in the sub-scanning direction by correcting the position of the recording head in the sub-scanning direction. It is desirable to include a recording head position correcting means for performing the above.
In other words, when the main scanning direction is the longitudinal direction of the lenticular lens, the direction in which the deviation between the recording position of the lenticular lens and the parallax image has a great influence on the quality of the stereoscopic image obtained by stereoscopically viewing the parallax image is the secondary direction. The detection head detects the relative position in the width direction (sub-scanning direction) of each lenticular lens over the longitudinal direction of the lenticular lens.
[0019]
In such a stereoscopic image forming apparatus, when the lens is a lenticular lens and the main scanning direction is the longitudinal direction of the lenticular lens by the detection head and the ink discharge position correcting means including the recording head position correcting means, the parallax For the recording of images, for each parallax image corresponding to each lenticular lens, the direction in which the lenticular lens and the position where the parallax image is recorded greatly affects the quality of the stereoscopic image obtained by stereoscopically viewing the parallax image, that is, the lenticular Since the lens can be moved while being aligned in the sub-scanning direction (width direction) of the lens, the shift of the recording position of the parallax image in the width direction of each lenticular lens can be reduced, and the lenticular lens and the parallax image can be accurately detected. Can be aligned well.
[0020]
In the stereoscopic image forming apparatus, when the lens is a lenticular lens and the main scanning direction is the width direction of the lenticular lens, the detection head includes a plurality of the lenticular lenses during main scanning. The ink discharge position correction means detects the relative position in the width direction of each lenticular lens across the lens, and the ink discharge position correction means temporally corrects the ink discharge timing from the recording head, thereby the ink discharge position in the main scanning direction. It is desirable to include a discharge timing correction means for correcting the above.
In other words, when the main scanning direction is the width direction of the lenticular lens, the direction in which the deviation between the recording position of the lenticular lens and the parallax image has a major effect on the quality of the stereoscopic image obtained by stereoscopically viewing the parallax image is the main direction. The detection head detects the relative position in the width direction (main scanning direction) of each lenticular lens across a plurality of lenticular lenses.
[0021]
In such a three-dimensional image forming apparatus, when the lens is a lenticular lens and the main scanning direction is the width direction of the lenticular lens by the detection head and the ink discharge position correction means including the discharge timing correction means, a parallax image In the direction of recording, for each parallax image corresponding to each lenticular lens, the lenticular lens and the position where the parallax image is recorded have a direction that greatly affects the quality of the stereoscopic image obtained by stereoscopically viewing the parallax image, that is, the lenticular lens Can be moved while being aligned in the main scanning direction (width direction), so that the shift of the recording position of the parallax image in the width direction of each lenticular lens can be reduced, and the lenticular lens and the parallax image can be accurately aligned. Can be aligned.
[0022]
Further, as a configuration of the stereoscopic image forming apparatus corresponding to the case where the lens is an eyelet lens, the detection head is arranged in the main scanning direction and the sub-scanning direction of each eyelet lens during main scanning. A recording head position correcting unit that detects a relative position and corrects the ink discharging position in the sub-scanning direction by correcting the position of the recording head in the sub-scanning direction; It is preferable that the apparatus includes an ejection timing correction unit that corrects the ink ejection position in the main scanning direction by temporally correcting the ink ejection timing from the recording head.
[0023]
In other words, when the lens is an eyelet lens, a parallax image is recorded in the center of each eyelet lens on the back surface of the lens sheet. The direction in which the deviation between the eye lens and the recording position of the parallax image greatly affects the quality of the stereoscopic image obtained by viewing, and the detection head is relative to the main scanning direction and the sub-scanning direction of each eye lens. Detect position.
For this reason, when the lens is an eyelet lens, both the “recording head position correcting means” and the “ejection timing correcting means” described in the case where the lens is a lenticular lens are provided as the ink discharging position correcting means. It is desirable.
[0024]
In such a three-dimensional image forming apparatus, when a lens is an eyelet lens by a detection head and an ink ejection position correction unit including a recording head position correction unit and an ejection timing correction unit, recording of a parallax image is performed as follows: For each parallax image corresponding to each eyelid lens, the eyelet lens and the position where the parallax image is recorded can be advanced while being aligned in the main scanning direction and the sub-scanning direction. The shift of the recording position of the parallax image in the main scanning direction and the sub-scanning direction of the lens can be reduced, and the eyelet lens and the parallax image can be accurately aligned.
[0025]
In the above-described stereoscopic image forming apparatus, it is desirable that the recording head position correcting unit is composed of a piezoelectric element.
In such a three-dimensional image forming apparatus, the recording head position correcting means is composed of a piezoelectric element that has a high response speed and has a small amount of expansion and contraction when a voltage is applied, and can be suitably used for fine adjustment of the position. Therefore, the lens and the parallax image can be easily and accurately aligned.
[0026]
In the stereoscopic image forming apparatus, it is preferable that the sheet feeding unit is configured to be capable of adjusting a feeding width of the lens sheet in the sub-scanning direction and functions as the recording head position correcting unit.
By using such a stereoscopic image forming apparatus, it is possible to easily align the lens and the parallax image with high accuracy without providing a special apparatus as a recording head position correcting unit.
[0027]
In the stereoscopic image forming apparatus, it is preferable that the detection head is an optical sensor.
By using such a three-dimensional image forming apparatus, it is possible to easily obtain a small-sized detection head with excellent detection accuracy, and to easily align the lens and the parallax image with high accuracy.
[0028]
In the above-described stereoscopic image forming apparatus, it is desirable that the detection head is composed of a two-divided optical sensor.
By using such a three-dimensional image forming apparatus, it is possible to easily obtain a detection head that can detect the relative position of each lens in one direction with respect to the recording head with excellent accuracy. In particular, each lens is a lenticular lens. This configuration is suitable for use when a lens is used, and can align the lenticular lens and the parallax image with higher accuracy.
[0029]
In the above-described stereoscopic image forming apparatus, it is desirable that the detection head is composed of four or more optical sensors.
By using such a stereoscopic image forming apparatus, it is possible to easily obtain a detection head capable of detecting the relative position of each lens in two or more directions with respect to the recording head with excellent accuracy. This configuration is suitable for the case where a lens that is a eyelid lens is used, and the eyelid lens and the parallax image can be more accurately aligned.
[0030]
In order to achieve the above object, the stereoscopic image forming method of the present invention uses the stereoscopic image forming apparatus according to any one of the above, and the plurality of the plurality of lenses on the back surface of the lens sheet in which a plurality of lenses are arranged on the surface. A stereoscopic image forming method for producing a stereoscopic image sheet by recording a parallax image at a position corresponding to each of the lenses, and the lens sheet is attached to the recording head and the detection head by the sheet moving unit. The recording head is moved in the main scanning direction by the recording head moving means by moving in the sub-scanning direction, the detection head is moved in the main scanning direction by the detection head moving means, and the detection head is The ink ejection position correcting means detects the relative position of each lens with respect to the recording head while moving in the main scanning direction. According to the lens position information detected by the detection head, the position at which the recording head ejects ink is corrected so that the recording position of the parallax image with respect to each lens is a predetermined position. The parallax image is recorded at a predetermined position on the back surface of the lens sheet.
[0031]
Such a stereoscopic image forming method is a method using any one of the above-described stereoscopic image forming apparatuses. The recording head is moved in the main scanning direction by the recording head moving means, and the detection head is detected by the detection head moving means. The recording head records the parallax image, the detection head detects the relative position of each lens with respect to the recording head, and the ink ejection position correction unit corrects the position at which the recording head ejects ink. Since they can proceed simultaneously, the parallax image can be recorded while aligning the lens and the position where the parallax image is recorded for each parallax image corresponding to each lens.
Therefore, the lens and the parallax image can be accurately aligned, a high-definition stereoscopic image sheet can be produced, and the size of the stereoscopic image sheet can be accommodated.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiments described below are for explaining the gist of the present invention, and do not limit the present invention unless otherwise specified.
[0033]
[First Embodiment]
In this embodiment, the lens sheet is a lenticular lens, and is inserted into the stereoscopic image forming apparatus so that the main scanning direction is the longitudinal direction of the lenticular lens. An example in the case of manufacturing will be described.
[0034]
FIG. 5 is a view showing a part of an example of a stereoscopic image sheet produced by the stereoscopic image forming apparatus of the present embodiment, and is a cross-sectional view seen from the width direction of the lenticular lens.
In FIG. 5, the code | symbol 6 has shown the stereo image sheet | seat. The stereoscopic image sheet 6 has a parallax image 60c recorded at a position corresponding to each of the lenticular lenses 60a on the back surface 60b of the lens sheet 60, and passes through the lenticular lens 60a to observe the parallax image 60c with both left and right eyes. By doing so, parallax occurs between the image 60d recognized by the right eye and the image 60e recognized by the left eye, and a stereoscopic image corresponding to this parallax is observed.
[0035]
FIG. 1 is a perspective view for explaining an example of a stereoscopic image forming apparatus of the present invention, and FIG. 2 is an enlarged view of a peripheral portion of a recording head in the stereoscopic image forming apparatus shown in FIG. FIG. 6 is a diagram illustrating a state in which a lens sheet is inserted into the stereoscopic image forming apparatus.
In FIG. 1, reference numeral 100 denotes a stereoscopic image forming apparatus. The stereoscopic image forming apparatus 100 includes a main body 10 and a sheet feeding unit (corresponding to “sheet moving means” in the claims) 50.
Moreover, in FIG. 1, the code | symbol 60 has shown the lens sheet. The lens sheet 60 is inserted into the stereoscopic image forming apparatus 100 and becomes a stereoscopic image sheet by recording a parallax image. The lens sheet 60 has a plurality of lenticular lenses 60a made of columnar aspheric lenses arranged on the front surface, and the back surface 60b is a recording surface.
Here, as the lens sheet 60, a transparent one having a pitch of the lenticular lens 60a of about 0.5 mm is preferably used.
[0036]
The main body 10 has a carriage (corresponding to a “supporting member” in the claims) 12 disposed so as to be on the back surface side 60b of the lens sheet 60 inserted into the main body 10, and a carriage moving means (described later). "Corresponding to" supporting member moving means "(also serving as" recording head moving means "and" detection head moving means ") in the claims. The carriage 12 includes a detection head 11b and an actuator 11c. (Corresponding to “recording head position correcting means” (also serving as “ink ejection position correcting means”) in claims), a cartridge 11 on which a recording head 11a and an ink bag (not shown) are mounted; Is attached.
[0037]
Further, the main body 10 is provided with an encoder 25 for detecting the rotation of the motor 15 and is directly connected to the rotation shaft of the motor 15. Further, the main body 10 is connected with a control line 26 for driving the motor 15 and the actuator 11c or the like, or for taking out a signal, and a control line 27 for inputting a control signal for driving the recording head. Yes.
[0038]
As shown in FIG. 2, the recording head 11a records a parallax image on the lens sheet 60 by ejecting ink in an ink bag from a nozzle 61, and performs recording by a so-called inkjet method. As the recording head 11a, for example, it is put into practical use for an ink jet printer, and a piezo jet type using a piezoelectric element or a bubble jet type using an electrothermal transducer as an energy generating element can be used. The coloring area and the coloring pattern can be arbitrarily set.
[0039]
The detection head 11b is composed of a two-divided optical sensor, and detects the relative position in the width direction of each lenticular lens 60a over the longitudinal direction of the lenticular lens 60a during main scanning, and a lens sheet for the recording head 11a. The relative position of the 60 lenticular lenses 60a is detected.
FIG. 3 is a diagram for explaining the configuration of a two-divided optical sensor. FIG. 3A shows a state in which the center of curvature of the lenticular lens and the convergent light of the detection light coincide with each other. FIG. 3B is a diagram showing a state where the center of curvature of the lenticular lens does not match the convergent light of the detection light.
[0040]
As shown in FIG. 3, the light beam from the light source 41 is collected by the light projecting lens 43 near the center of curvature 45 of the lenticular lens 60 a, passes through the half mirror 48, and enters the lens sheet 60. At this time, the light incident on the lens sheet 60 is substantially perpendicular to the back surface 60 b of the lens sheet 60, and part of the light is reflected by Fresnel reflection to become a light flux 49, and becomes a light flux 42 through the half mirror 48. Since the light beam 42 can be regarded as diverging light from the center of curvature 45 of the lenticular lens 60a, it is converted into convergent light by the condensing lens arranged so that the center of curvature 45 of the lenticular lens 60a is an object point position on the sensor 44. To form a one-dimensional line-shaped imaging spot.
[0041]
A dividing line 44c is provided on the sensor 44, and the center of curvature 45 of the lenticular lens 60a and the convergent light 42 of the detection light coincide with each other at the formation position of the imaging spot formed on the sensor 44. If it is in a state, as shown by reference numeral 44a in FIG. 3A, it coincides with the dividing line 44c, and if the center of curvature 45 of the lenticular lens 60a does not coincide with the convergent light 42 of the detection light, As shown by reference numeral 44b in FIG. 3B, a difference is generated.
That is, in the two-divided optical sensor shown in FIG. 3, the relative position in the width direction of the lenticular lens 60a is detected based on the detection signal difference between the formation position of the imaging spot and the dividing line 44c on the sensor 44. ing.
[0042]
The actuator 11c is made of a piezoelectric element such as a laminated piezo actuator, and the recording position of the parallax image with respect to each lenticular lens 60a is determined according to the lens position information of each lenticular lens 60a detected by the detection head 11b. The position at which the recording head 11a ejects ink is corrected in the sub-scanning direction so as to be a predetermined position.
[0043]
The carriage moving means moves the carriage 12 in the main scanning direction, and includes a frame 13, a guide rod 14, a motor 15, gears 17 and 21, a driving wheel 18, a timing belt 19, and a driven wheel 20. As shown in FIG. 1, the carriage 12 is supported by a pair of guide bars 14 provided on the frame 13 so as to be movable in the width direction (main scanning direction) of the guide bars 14. As the motor 15 serving as a drive source for driving the carriage 12, for example, a DC motor is provided, and is driven to rotate in a certain direction. The rotation of the motor 15 is transmitted to the gear 17 and the driving wheel 18, and the timing belt 19 is driven to rotate by rotating the driving wheel 18. Further, the driven wheel 20 is rotated by the rotational drive of the timing belt 19, and the gear 21 connected to the driven wheel 20 is rotated. The timing belt 19 is provided with a drive pin 30 for reciprocating the carriage 12, and the carriage 12 is reciprocated by rotational driving in one direction of the timing belt 19.
[0044]
The sheet feeding unit 50 is fixed to the main body 10 by being screwed to a guide surface 13a obtained by bending the frame 13 of the main body 10 upward at a right angle. As a driving source of the sheet feeding unit 50, rotation of the gear 21 connected to the driven wheel 20 is supplied via a gear group 51 and a transmission shaft (not shown). The gear group 51 is connected to a pair of paper feed rotors so as to feed a predetermined amount of the lens sheet 60 inserted into the stereoscopic image forming apparatus 100.
[0045]
Next, a method for recording a parallax image on the lens sheet 60 using such a stereoscopic image forming apparatus 100 and producing a stereoscopic image sheet shown in FIG. 5 will be described.
When the control voltage of the motor 15 or the actuator 11c is supplied via the control line 26 and the control signal is supplied to the recording head 11a via the control line 27, first, the longitudinal direction of the lenticular lens 60a is the main scanning direction. The lens sheet 60 is inserted into the stereoscopic image forming apparatus 100 so as to move in the sub-scanning direction with respect to the recording head 11a and the detection head 11b by the sheet feeding unit 50, and the recording head 11a and The parallax image in the sub-scanning direction with respect to the detection head 11b is aligned with the recording position.
[0046]
Next, the recording head 11a and the detection head 11b are moved in the main scanning direction by the carriage moving means. At this time, the detection head 11b detects the relative position of each lenticular lens 60a with respect to the recording head 11a while moving in the main scanning direction, and the actuator 11c detects each lenticular lens according to the lens position information detected by the detection head 11b. The position where the recording head 11a discharges ink is corrected so that the recording position of the parallax image with respect to 60a becomes a predetermined position, and the recording head 11a discharges the ink in the ink bag from the nozzle 61, so that FIG. As shown in FIG. 5, the parallax image 60c is recorded at a predetermined position on the back surface 60b of the lens sheet 60, which is the position corrected by the actuator 11c.
[0047]
As the parallax image recorded here, for example, about 3 parallax images 60c can be written to each lenticular lens 60a with a resolution of 1200 DPI as shown in FIG.
In the writing of the parallax image 60c, when the production of the high-definition stereoscopic image sheet 6 is prioritized, the recording head 11a has one row each time the carriage moving unit performs an operation of moving in the main scanning direction. It is desirable to write the parallax image 60c corresponding to the minute lenticular lens 60a, and the lens sheet 60 inserted into the three-dimensional image forming apparatus 100 is one in which the pitch of the lenticular lens 60a is accurately formed. In this case, or when priority is given to recording the parallax image 60c at a high speed, for example, the recording head 11a has about three rows each time the carriage moving unit performs an operation of moving in the main scanning direction once. A parallax image 60c corresponding to the lenticular lens 60a can be written.
[0048]
Thereafter, the lens sheet 60 is moved again in the sub-scanning direction with respect to the recording head 11a and the detection head 11b by the carriage moving unit, and the parallax in the sub-scanning direction with respect to the recording head 11a and the detection head 11b on the back surface 60b of the lens sheet 60. As shown in FIG. 4, the position where the image 60c is recorded is aligned with the position where the parallax image 60c is not recorded, and the parallax image 60c is recorded in the same manner as described above. Further, in the same manner as described above, the stereoscopic image sheet 6 shown in FIG. 5 is obtained by repeating the movement of the lens sheet 60 in the sub-scanning direction and the recording of the parallax image 60c until the entire parallax image is recorded on the lens sheet 60. Produced.
[0049]
In such a stereoscopic image forming apparatus 100 and a stereoscopic image forming method, the recording head 11a and the detection head 11b are both moved in the main scanning direction by the carriage moving means, and the recording head 11a records the parallax image 60c and the detection head. Since the detection of the relative position of each lenticular lens 60a with respect to the recording head 11a by 11b and the correction of the position at which the recording head 11a ejects ink by the actuator 11c can proceed simultaneously, the parallax image 60c is converted into each lenticular lens 60a. Can be recorded while aligning the lenticular lens 60a and the position where the parallax image 60c is recorded for each parallax image 60c corresponding to.
[0050]
As a result, the lenticular lens 60a and the parallax image due to an error in inserting the lens sheet 60 into the stereoscopic image forming apparatus 100, an error due to the movement of the lens sheet 60 by the sheet feeding unit 50, and an error due to the expansion and contraction of the lens sheet 60 Since the positional deviation from 60c can be reduced and the lenticular lens 60a and the parallax image 60c can be accurately aligned, a high-definition stereoscopic image sheet 6 can be produced and a stereoscopic image sheet can be produced. 6 can be accommodated.
[0051]
In particular, in the stereoscopic image forming apparatus 100 of the present embodiment, the parallax image 60c is recorded by the detection head 11b and the actuator 11c for each parallax image 60c corresponding to each lenticular lens 60a. Since the recording position can be advanced while being aligned in the direction that greatly affects the quality of the stereoscopic image obtained by stereoscopically viewing the parallax image 60c, that is, in the sub-scanning direction (width direction) of the lenticular lens 60a. The shift of the recording position of the parallax image 60c in the width direction of each lenticular lens 60a can be reduced, and the lenticular lens 60a and the parallax image 60c can be accurately aligned.
[0052]
In this stereoscopic image forming apparatus 100, since the recording head 11a and the detection head 11b are both arranged on the back surface 60b side of the lens sheet 60, the recording head 11a and the detection head 11b are on the front surface side and the back surface 60b side. When the recording head 11a and the detection head 11b are attached to the stereoscopic image forming apparatus 100, the structure of the attachment portion to the stereoscopic image forming apparatus 100 can be simplified, and the stereoscopic image forming apparatus 100 is manufactured. In addition, the manufacturing process can be simplified. Further, the space for arranging the recording head 11a and the detection head 11b can be reduced, and the stereoscopic image forming apparatus 100 can be reduced in size and weight.
Furthermore, since the surface on which the detection head 11b detects the lens position information and the surface on which the parallax image 60c is recorded by the recording head 11a are both on the back surface 60b side of the lens sheet 60, an error in the lens position information detected by the detection head 11b. Since the detection accuracy of the relative position of each lenticular lens 60a relative to the recording head 11a by the detection head 11b and the correction accuracy by the actuator 11c are improved, the alignment between the lenticular lens 60a and the parallax image 60c is further improved. Accuracy can be improved.
[0053]
In this stereoscopic image forming apparatus, the recording position of the parallax image with respect to each lenticular lens 60a is set to a predetermined position according to the lens position information of each lenticular lens 60a detected by the detection head 11b by the actuator 11c. Since the recording head 11a corrects the ink ejection position in the sub-scanning direction, the response speed at the time of correction is high, the fine adjustment of the position of the recording head 11a can be easily performed with high accuracy, and the parallax with the lenticular lens 60a. The image can be easily and accurately aligned.
[0054]
Further, since the detection head 11b is composed of a two-part optical sensor, it is small and excellent in detection accuracy, and the relative position in the width direction of each lenticular lens 60a with respect to the recording head 11a can be easily detected with excellent accuracy. The detection head 11b can be used, and the lenticular lens 60a and the parallax image 60c can be aligned with higher accuracy.
[0055]
[Second Embodiment]
In this embodiment, the lens sheet is a lenticular lens, and the lens sheet is inserted into the stereoscopic image forming apparatus so that the main scanning direction is the width direction of the lenticular lens to produce a stereoscopic image sheet. An example of the case will be described.
Specifically, this embodiment is different from the stereoscopic image forming apparatus shown in FIGS. 1 and 2 described in the first embodiment described above in that the main scanning direction is the width direction of the lenticular lens. 6 is an example in which the three-dimensional image sheet shown in FIG. 5 is produced by inserting the lens sheet shown in FIG. For this reason, in this embodiment, detailed description of parts common to the first embodiment will be omitted, and only different parts will be described in detail.
[0056]
When the main scanning direction is the width direction of the lenticular lens 60a, the direction in which the deviation between the recording position of the lenticular lens 60a and the parallax image 60c has a great effect on the quality of the stereoscopic image obtained by stereoscopically viewing the parallax image 60c. Is different from the first embodiment in the main scanning direction.
[0057]
FIG. 6 shows a state in which a parallax image is recorded by a recording head on a lens sheet inserted in a stereoscopic image forming apparatus so that the lens is a lenticular lens and the main scanning direction is the width direction of the lenticular lens. It is a schematic perspective view.
As shown in FIG. 6, in this embodiment, since the main scanning direction is the width direction of the lenticular lens 60a, the detection head 11b in this embodiment is a two-part optical sensor as in the first embodiment. The lenticular lens 60a of the lens sheet 60 with respect to the recording head 11a is detected relative to the recording head 11a. Unlike the first embodiment, each lenticular lens covers a plurality of lenticular lenses 60a during main scanning. The relative position of the lens 60a in the width direction (main scanning direction) is detected.
[0058]
Further, in the present embodiment, since the main scanning direction is the width direction of the lenticular lens 60a, instead of the two-divided optical sensor shown in FIG. In the two-divided optical sensor shown in FIG. 3, the angle of the dividing line 44c is rotated by 90 degrees.
[0059]
In the present embodiment, an ejection timing correction unit is provided as an ink ejection position correction unit in place of the actuator 11c shown in the first embodiment.
The ejection timing correction means is provided in a control unit (not shown) that controls the timing at which the recording head 11b ejects ink according to the parallax image 60c recorded by the recording head 11b. According to the lens position information of each lenticular lens 60a detected by 11b, the ejection timing of the ink from the recording head 11b is temporally corrected so that the recording position of the parallax image with respect to each lenticular lens 60a becomes a predetermined position. Thus, the position at which the recording head 11a ejects ink is corrected in the main scanning direction.
The temporal correction of the ink ejection timing from the recording head 11b is performed by a control signal supplied to the recording head 11a via the control line 27 according to the lens position information of each lenticular lens 60a detected by the detection head 11b. Done.
[0060]
Next, a method for recording a parallax image on the lens sheet 60 using such a stereoscopic image forming apparatus and manufacturing the stereoscopic image sheet shown in FIG. 5 will be described.
When a control voltage of the motor 15 is supplied via the control line 26 and a control signal is supplied to the recording head 11a via the control line 27, first, the width direction of the lenticular lens 60a is set to the main scanning direction. The lens sheet 60 is inserted into the stereoscopic image forming apparatus, and is moved in the sub-scanning direction with respect to the recording head 11a and the detection head 11b by the sheet feeding unit 50, and the recording head 11a and the detection head 11b on the back surface of the lens sheet 60 are moved. The parallax image in the sub-scanning direction is adjusted to the recording position.
[0061]
Next, the recording head 11a and the detection head 11b are moved in the main scanning direction by the carriage moving means. At this time, the detection head 11b detects the relative position of each lenticular lens 60a with respect to the recording head 11a while moving in the main scanning direction, and the ejection timing correction unit detects each position according to the lens position information detected by the detection head 11b. By correcting the position where the recording head 11a ejects ink so that the recording position of the parallax image with respect to the lenticular lens 60a is a predetermined position, the recording head 11a ejects the ink in the ink bag from the nozzle 61, As shown in FIG. 6, a parallax image 60c is recorded at a predetermined position on the back surface 60b of the lens sheet 60, which is the position corrected by the ejection timing correction means.
[0062]
Thereafter, the lens sheet 60 is moved again in the sub-scanning direction with respect to the recording head 11a and the detection head 11b by the carriage moving unit, and the parallax in the sub-scanning direction with respect to the recording head 11a and the detection head 11b on the back surface 60b of the lens sheet 60. As shown in FIG. 6, the position where the image 60c is recorded is aligned with the position where the parallax image 60c is not recorded, and the parallax image 60c is recorded in the same manner as described above.
Further, in the same manner as described above, the stereoscopic image sheet 6 shown in FIG. 5 is obtained by repeating the movement of the lens sheet 60 in the sub-scanning direction and the recording of the parallax image 60c until the entire parallax image is recorded on the lens sheet 60. Produced.
[0063]
In the stereoscopic image forming apparatus according to the present embodiment, the parallax image 60c is recorded for each parallax image 60c corresponding to each lenticular lens 60a by the detection head 11b and the ejection timing correction unit. Since the recording position can be advanced while being aligned in the direction that greatly affects the quality of the stereoscopic image obtained by stereoscopically viewing the parallax image 60c, that is, in the main scanning direction (width direction) of the lenticular lens 60a. The shift of the recording position of the parallax image 60c in the width direction of each lenticular lens 60a can be reduced, and the lenticular lens 60a and the parallax image 60c can be accurately aligned.
[0064]
[Third Embodiment]
In the present embodiment, an example will be described in which a three-dimensional image sheet is manufactured by using a lens sheet that is a square eye lens and inserting the lens sheet into a three-dimensional image forming apparatus.
Specifically, in the present embodiment, a lens sheet whose lens is an eyelet lens is inserted into the stereoscopic image forming apparatus shown in FIGS. 1 and 2 described in the first and second embodiments. This is an example of producing a stereoscopic image sheet. For this reason, in this embodiment, the detailed description of the part which is common in the 1st and 2nd embodiment is abbreviate | omitted, and only a different part is demonstrated in detail.
[0065]
FIG. 7 is a schematic perspective view showing a state where a parallax image is recorded by a recording head on a lens sheet in which the lens is an eyelet lens.
In FIG. 7, reference numeral 70 indicates a lens sheet. The lens sheet 70 is inserted into a stereoscopic image forming apparatus and becomes a stereoscopic image sheet by recording a parallax image. Further, the lens sheet 70 has a plurality of convex lenses (branch eye lenses) 70a arranged on the front surface, and the back surface 70b is a recording surface.
Here, as the lens sheet 70, a lens sheet that is transparent and has an interval (pitch) between adjacent eyelet lenses 70a of about 0.1 mm to 1 mm is preferably used.
[0066]
As shown in FIG. 7, when the lens is the eye lens 70 a, the parallax image 70 c is recorded at the center of each eye lens 70 a on the back surface 70 b of the lens sheet 70, so Similarly, the scanning direction is a direction in which the shift between the eyelid lens 70a and the recording position of the parallax image 70c greatly affects the quality of the stereoscopic image obtained by stereoscopically viewing the parallax image 70c.
As shown in FIG. 7, in this embodiment, since the lens is the eyelet lens 70a, the detection head 11b in this embodiment is composed of an optical sensor, as in the first embodiment. Although the relative position of the lenticular lens 60a of the lens sheet 60 with respect to the recording head 11a is detected, unlike the first embodiment, the main scanning direction and the sub-scanning direction of each eyelet lens 70a during the main scanning. The relative position of is detected.
[0067]
In this embodiment, since the lens is the eyelet lens 70a, the optical sensor constituting the detection head 11b is replaced with the optical sensor 2 shown in FIG. 3 instead of the two-part optical sensor shown in FIG. The dividing line in the dividing optical sensor includes a four-dividing optical sensor composed of both the dividing line 44c and the dividing line 44c rotated by 90 degrees.
In the quadrant optical sensor, divergent light from the center of curvature of the eye lens 70a is converted into convergent light by a condensing lens arranged so that the center of curvature of the eye lens 70a is an object point position. Then, an image is formed on the sensor 44 to form an imaging spot.
[0068]
The formation position of the imaging spot formed on the sensor 44 coincides with the dividing direction of the sensor 44 if the center of curvature of the eyelet lens 70a is coincident with the convergent light of the detection light. If the center of curvature of the eye lens 70a does not coincide with the convergent light of the detection light, a difference is generated.
That is, the inclination of the eyelet lens 70a is detected by the difference between the formation position of the imaging spot and the dividing line on the sensor 44, and the relative positions of each eyelet lens 70a in the main scanning direction and the sub-scanning direction are detected. It has become so.
[0069]
In this embodiment, the ink discharge position correcting means includes both the actuator 11c shown in the first embodiment and the discharge timing correcting means shown in the second embodiment.
[0070]
Next, a method of recording a parallax image on the lens sheet 70 using such a stereoscopic image forming apparatus and producing a stereoscopic image sheet will be described.
When a control voltage or the like of the motor 15 is supplied via the control line 26 and a control signal is supplied to the recording head 11a via the control line 27, first, the lens sheet 70 is inserted into the stereoscopic image forming apparatus, and the sheet The feeding unit 50 moves the recording head 11a and the detection head 11b in the sub-scanning direction, and adjusts the parallax image in the sub-scanning direction with respect to the recording head 11a and the detection head 11b on the back surface of the lens sheet 70.
[0071]
Next, the recording head 11a and the detection head 11b are moved in the main scanning direction by the carriage moving means. At this time, the detection head 11b detects the relative position of each eyelet lens 70a with respect to the recording head 11a while moving in the main scanning direction,
According to the lens position information detected by the detection head 11b, the actuator 11c corrects the position at which the recording head 11a ejects ink so that the recording position of the parallax image 70c with respect to each eyelet lens 70a becomes a predetermined position. At the same time, the recording head 11a applies ink to the ejection timing correction means so that the recording position of the parallax image 70c with respect to each eyelet lens 70a becomes a predetermined position according to the lens position information detected by the detection head 11b. The ejection position is corrected, and the recording head 11a ejects the ink in the ink bag from the nozzle 61, so that the lens sheet is the position corrected by the actuator 11c and the ejection timing correction means as shown in FIG. The parallax image 70c is recorded at a predetermined position on the back surface 70b of the 70.
[0072]
Thereafter, the lens sheet 70 is moved again in the sub-scanning direction with respect to the recording head 11a and the detection head 11b by the carriage moving means, and the parallax in the sub-scanning direction with respect to the recording head 11a and the detection head 11b on the back surface 70b of the lens sheet 70. As shown in FIG. 7, the position where the image 70c is recorded is aligned with the position where the parallax image 70c is not recorded, and the parallax image 70c is recorded in the same manner as described above. Further, in the same manner as described above, a stereoscopic image sheet is produced by repeating the movement of the lens sheet 70 in the sub-scanning direction and the recording of the parallax image 70c until the entire parallax image is recorded on the lens sheet 70.
[0073]
In such a three-dimensional image forming apparatus, the parallax image 70c is recorded for each parallax image 70c corresponding to each fringe lens 70a by the detection head 11b, the actuator 11c, and the ejection timing correction means. And the position at which the parallax image 70c is recorded can be advanced while being aligned in the main scanning direction and the sub-scanning direction, so that the parallax image 70c is recorded in the main scanning direction and the sub-scanning direction of each eyelet lens 70a. The positional deviation can be reduced, and the eyelid lens 70a and the parallax image 70c can be accurately aligned.
[0074]
Further, in this stereoscopic image forming apparatus, since the detection head 11b is composed of a four-divided optical sensor, relative to the recording head 11a in the two directions of the main scanning direction and the sub-scanning direction of each eyelet lens 70a. The detection head 11a that can detect the position with excellent accuracy can be easily obtained, and the eyelid lens 70a and the parallax image 70c can be more accurately aligned.
[0075]
In the three-dimensional image forming apparatus according to the present invention, the recording head position correcting unit can be composed of the actuator 11c as in the example shown in the above-described embodiment. It is only necessary that the ink ejection position in the sub-scanning direction can be corrected by correcting in the scanning direction. For example, the sheet feeding unit is configured to be able to adjust the feeding width of the lens sheet in the sub-scanning direction, and the recording head position You may make it function as a correction | amendment means.
In this way, when the sheet feeding unit is a three-dimensional image forming apparatus that functions as a recording head position correcting unit, the lens and the parallax image are easily aligned with high accuracy without providing a special device as the recording head position correcting unit. Can be possible.
[0076]
Further, in the stereoscopic image forming apparatus of the present invention, when a lens sheet having a lenticular lens is used, the displacement of the recording position of the parallax image 60c in the longitudinal direction of the lenticular lens 60a is a stereoscopic view. However, when the main scanning direction is not the longitudinal direction or the width direction of the lenticular lens 60a, or when the lens sheet 60 is inserted into the stereoscopic image forming apparatus, the lens sheet is caused by the sheet moving means. When the main scanning direction does not coincide with the longitudinal direction or the width direction of the lenticular lens 60a due to an error associated with the movement of the lenticular lens, or in order to produce a higher-definition stereoscopic image sheet 6, the parallax image 60c in the longitudinal direction of the lenticular lens 60a If you want to reduce the recording position shift In the same manner as in the case where the lens sheet shown in the third embodiment is a lens having the eyelet lens 70a, the ink discharge position correction means, the print head position correction means and the discharge timing correction are used. Accordingly, the shift of the recording position of the parallax image 60c in the main scanning direction and the sub-scanning direction of the lenticular lens 60a can be reduced, and the lenticular lens 60a and the parallax image 60c can be made more accurate. Can be aligned.
[0077]
The stereoscopic image forming apparatus of the present invention, as in the example shown in the above-described embodiment, produces a high-definition stereoscopic image sheet 6 by recording a parallax image on a lens sheet. By using something other than a lens sheet, it can also be used as a printer.
[0078]
【The invention's effect】
In the stereoscopic image forming apparatus of the present invention, the recording head is moved in the main scanning direction by the recording head moving unit, the detection head is moved in the main scanning direction by the detection head moving unit, and the recording head records parallax images; Since the detection head can detect the relative position of each lens with respect to the recording head and the correction of the position at which the recording head ejects ink by the ink ejection position correction unit can proceed simultaneously, the parallax image corresponds to each lens. Recording can be performed while aligning the lens and the position where the parallax image is recorded for each parallax image.
[0079]
Therefore, compared with the case where the lens and the parallax image are aligned by detecting the relative position between the lens sheet and the stereoscopic image forming apparatus, the alignment can be performed with very high accuracy.
Accordingly, the positional deviation between the lens and the parallax image due to the error in inserting the lens sheet into the stereoscopic image forming apparatus, the error due to the movement of the lens sheet by the sheet moving unit, and the error due to the expansion / contraction of the lens sheet is reduced. In addition, a high-definition stereoscopic image sheet can be produced and the size of the stereoscopic image sheet can be increased.
[Brief description of the drawings]
FIG. 1 is a perspective view for explaining an example of a stereoscopic image forming apparatus of the present invention.
FIG. 2 is an enlarged view showing a peripheral portion of a recording head in the stereoscopic image forming apparatus shown in FIG. 1, and is a diagram showing a state in which a lens sheet is inserted into the stereoscopic image forming apparatus.
FIG. 3 is a diagram for explaining a configuration of a two-divided optical sensor, and FIG. 3A shows a state in which the center of curvature of the lenticular lens and the convergent light of the detection light coincide with each other. FIG. 3B is a diagram showing a state where the center of curvature of the lenticular lens does not match the convergent light of the detection light.
FIG. 4 shows a state in which a parallax image is recorded by a recording head on a lens sheet inserted in a stereoscopic image forming apparatus so that a lens is a lenticular lens and a main scanning direction is a longitudinal direction of the lenticular lens. It is a schematic perspective view.
FIG. 5 is a view showing a part of an example of a stereoscopic image sheet, and is a cross-sectional view seen from the width direction of a lenticular lens.
FIG. 6 shows a state in which a parallax image is recorded by a recording head on a lens sheet inserted in a stereoscopic image forming apparatus so that the lens is a lenticular lens and the main scanning direction is the width direction of the lenticular lens. It is a schematic perspective view.
FIG. 7 is a schematic perspective view showing a state in which a parallax image is recorded by a recording head on a lens sheet in which a lens is an eyelet lens.
[Explanation of symbols]
6 3D image sheet
10 Body
11 cartridges
11a Recording head
11b Detection head
11c Actuator
12 Carriage
13 frames
14 Guide bar
15 Motor
17 Gear
18 Drive wheels
19 Timing belt
20 Follower wheel
26, 27 Control line
30 Drive pin
50 Sheet feeding unit (sheet moving means)
51 Gear group
60, 70 Lens sheet
60a lenticular lens
60c, 70c parallax image
61 nozzles
70a Acupuncture lens
100 stereoscopic image forming apparatus

Claims (10)

A stereoscopic image forming apparatus for producing a stereoscopic image sheet by recording a parallax image at a position corresponding to each of the plurality of lenses on the back surface of a lens sheet having a plurality of lenses arranged on the front surface,
A recording head that records the parallax image by ejecting ink to a predetermined position on the back surface of the lens sheet while moving in the main scanning direction with respect to the lens sheet;
A recording head moving means for moving the recording head in the main scanning direction;
A detection head comprising a two-divided optical sensor and detecting a relative position of each lens with respect to the recording head while moving in the main scanning direction;
Detection head moving means for moving the detection head in the main scanning direction;
An ink ejection position correction unit that corrects a position at which the recording head ejects ink so that a recording position of the parallax image with respect to each lens is a predetermined position according to lens position information detected by the detection head; ,
A stereoscopic image forming apparatus comprising at least sheet moving means for moving the lens sheet in the sub-scanning direction with respect to the recording head and the detection head. A stereoscopic image forming apparatus for producing a stereoscopic image sheet by recording a parallax image at a position corresponding to each of the plurality of lenses on the back surface of a lens sheet having a plurality of lenses arranged on the front surface,
A recording head that records the parallax image by ejecting ink to a predetermined position on the back surface of the lens sheet while moving in the main scanning direction with respect to the lens sheet;
A recording head moving means for moving the recording head in the main scanning direction;
A detection head comprising four or more optical sensors, and detecting a relative position of each lens with respect to the recording head while moving in the main scanning direction;
Detection head moving means for moving the detection head in the main scanning direction;
An ink ejection position correction unit that corrects a position at which the recording head ejects ink so that a recording position of the parallax image with respect to each lens is a predetermined position according to lens position information detected by the detection head; ,
A stereoscopic image forming apparatus comprising at least sheet moving means for moving the lens sheet in the sub-scanning direction with respect to the recording head and the detection head. The recording head and the detection head are installed on the same support member, and provided with support member moving means for moving the support member in the main scanning direction,
3. The stereoscopic image forming apparatus according to claim 1, wherein the support member moving unit serves as the recording head moving unit and the detection head moving unit. 4.   4. The three-dimensional image forming apparatus according to claim 1, wherein both the recording head and the detection head are disposed on a back surface side of the lens sheet. 5. When the lens is an eyelet lens,
The detection head detects a relative position of each eyelet lens in the main scanning direction and the sub-scanning direction during main scanning,
The ink ejection position correcting means corrects the ink ejection position in the sub-scanning direction by correcting the position of the recording head in the sub-scanning direction; and
5. The discharge timing correction means for correcting the ink discharge position in the main scanning direction by temporally correcting the ink discharge timing from the recording head. The stereoscopic image forming apparatus according to any one of the above. When the lens is a lenticular lens and the main scanning direction is the longitudinal direction of the lenticular lens,
The detection head detects the relative position in the width direction of each lenticular lens over the longitudinal direction of the lenticular lens during main scanning,
The ink discharge position correcting means comprises recording head position correcting means for correcting the ink discharge position in the sub-scanning direction by correcting the position of the recording head in the sub-scanning direction. The three-dimensional image forming apparatus according to any one of claims 1 to 4.   The three-dimensional image forming apparatus according to claim 5, wherein the recording head position correcting unit includes a piezoelectric element. The sheet feeding means is configured to be capable of adjusting a feeding width of the lens sheet in the sub-scanning direction;
The three-dimensional image forming apparatus according to claim 5, wherein the three-dimensional image forming apparatus functions as the recording head position correcting unit. When the lens is a lenticular lens and the main scanning direction is the width direction of the lenticular lens,
The detection head detects a relative position in the width direction of each lenticular lens across the plurality of lenticular lenses during main scanning,
The ink discharge position correcting means comprises discharge timing correcting means for correcting the ink discharge position in the main scanning direction by temporally correcting the ink discharge timing from the recording head. The three-dimensional image forming apparatus according to any one of claims 1 to 4. The stereoscopic image forming apparatus according to any one of claims 1 to 9, wherein a parallax image is recorded at a position corresponding to each of the plurality of lenses on a back surface of a lens sheet having a plurality of lenses arranged on the front surface. 3D image forming method for producing a 3D image sheet,
Moving the lens sheet in the sub-scanning direction with respect to the recording head and the detection head by the sheet moving means;
The recording head is moved in the main scanning direction by the recording head moving means, and the detection head is moved in the main scanning direction by the detection head moving means,
The detection head detects a relative position of each lens with respect to the recording head while moving in the main scanning direction;
The ink ejection position correction unit corrects the position at which the recording head ejects ink so that the recording position of the parallax image with respect to each lens is a predetermined position according to the lens position information detected by the detection head. And
A three-dimensional image forming method, wherein the recording head records the parallax image at a predetermined position on a back surface of the lens sheet by discharging ink.

Images