JPH0785569B2 - Two-dimensional imaging device - Google Patents

Description

Detailed Description of the Invention

[Industrial applications]

The present invention relates to a two-dimensional image pickup device of a type that mechanically performs a sub-scan using a one-dimensional image pickup device.

[Prior art]

FIG. 7 is a perspective view showing a conventional two-dimensional image pickup device disclosed in Japanese Patent Laid-Open No. 58-69173, and FIG. 8 is an exploded perspective view of a carriage for moving an element of the two-dimensional image pickup device and a guide rail.
FIG. 9 is a sectional view showing the set state of FIG. In the figure, 1 is a frame of the two-dimensional imaging device, 2 is a guide rail mounted on the frame 1, and 3 is a guide rail 2 mounted on the guide rail 2 via bearings 4,5 (see FIGS. 8 and 9). The element moving carriage 3 is movably supported in the direction A or B in FIG.
A one-dimensional image pickup device (not shown) is attached to.
6 is an arm of the element moving carriage 3, 7 is a spring for downward biasing load connected to the arm 6, 8 is arranged below the arm 6, and is fixedly mounted on the frame 1 via a mounting member 9. Micrometer head
The micrometer head 8 has a spindle 10 connected to the arm 6 and a micrometer type motion conversion mechanism 11 for converting the input rotational motion into an axial linear motion of the spindle 10 and the rotational motion. The rotary encoder 12 detects and generates a pulse for each predetermined rotation angle, and the spindle 10 pushes up the arm 6 of the element moving carriage 3 against the spring 7. Reference numeral 13 is an input gear attached to the rotary input shaft of the micrometer head 8, 14 is an electric rotary motor installed near the micrometer head 8, and 15 is the input shaft attached to the output shaft of the motor 14. An output gear meshed with the gear 13, an upper limit switch 16 arranged above the element moving carriage 3, and a lower limit switch 17 arranged below the element moving carriage 3, The upper limit switch 16 and the lower limit switch 17 are pushed by the element moving carriage 3 when the element moving carriage 3 moves up and down (linear motion) and reaches a predetermined position, so that the motor is moved. 14 is automatically stopped. Reference numeral 18 denotes an optical system which is mounted on the frame 1 and forms an image of a subject on an image forming surface. Reference numeral 19 denotes a rear eccentric position of the optical system 18 for connecting the one-dimensional image pickup element of the element moving carriage 3 and the optical system 18. This is a disc-shaped filter replacement carriage rotatably supported between the filter replacement carriage 19. The filter replacement carriage 19 includes a red filter 20, a green filter 21, a blue filter 22, and a black and white filter 23.
Are arranged at equal angular intervals. In 24, the above-mentioned filter replacement carriage 19 is intermittently rotated to drive the above red,
This is an electric rotary filter switching motor that switches each of the green, blue, and black and white filters 20 to 23 to a position corresponding to the optical system 18. Next, the operation will be described. When the motor 14 is started, the output gear 15 and the input wave wheel 13
The rotation input shaft of the motion conversion mechanism 11 is rotationally driven via
The rotational force is converted into a linear motion by the motion conversion mechanism 11 and transmitted to the micrometer head 8, whereby the arm 6 of the element moving carriage 3 performs a linear motion, and the one-dimensional movement of the element moving carriage 3 is performed. The image pickup device is scanned along the guide rail 2. The linear movement range of the element moving carriage 3 during this scanning is determined by counting the pulses from the rotary encoder 12. Further, by intermittently rotating the filter replacement carriage 19 by the filter switching motor 24,
Any one of various color filters 20 to 23 of red, green, blue and black and white is switched to a position corresponding to the optical system 18.

[Problems to be Solved by the Invention]

Since the conventional two-dimensional image pickup apparatus is configured as described above, not only the element moving carriage 3 and the filter exchanging carriage 19 are individually driven by the dedicated electric rotary motors 14 and 24, respectively. , Electric rotary motor 14
The rotary motion of the device is converted into a linear motion and transmitted to the element moving carriage 3, and the micrometer head 8 for sub-scanning the element moving carriage 3 is required. Replacement carriage 19
Since it is also a rotary type, it becomes a color filter having a size corresponding to the sub-scanning distance of the one-dimensional image pickup device 25 at the time of switching and changing the color filter, and the outer shape of this color filter becomes large. However, there is a problem that the size becomes large and the cost becomes high. The present invention has been made to solve the above-mentioned problems, and the element moving carriage and the filter exchanging carriage can be driven by a single shared linear motor, and the overall size of the apparatus can be reduced and the cost can be reduced. An object is to obtain an imaging device.

[Means for solving problems]

A two-dimensional image pickup apparatus according to the present invention mounts a one-dimensional image pickup element positioned corresponding to an optical system on an element moving carriage that is movable in the sub-scanning direction, and includes the optical system and the one-dimensional image pickup element. Various color filters are mounted on a filter exchange carriage that is movably supported in the sub-scanning direction, and magnetic circuits for driving the carriage are arranged on both sides of the element moving carriage. An element driving voice coil that crosses a magnetic field to generate a driving force of the element moving carriage when energized, and a color filter that crosses a magnetic field of the magnetic circuit to generate a driving force of the filter replacement carriage when energized. A voice coil for replacement is provided.

[Work]

In the two-dimensional imaging apparatus according to the present invention, when the voice coil for driving the element in the magnetic field of the magnetic circuit is energized, the voice coil generates a driving force for the carriage for moving the element,
The driving force causes the element moving carriage to move, so that the one-dimensional image pickup element is sub-scanned. Also,
When the voice coil for color filter exchange in the magnetic field of the magnetic circuit is energized, the drive force generated in the voice coil moves the filter exchange carriage in the sub-scanning direction to switch and exchange the color filters. To be done. In this way, the magnetic circuit also serves as a drive source for both the element moving carriage and the filter exchanging carriage, so that the entire apparatus can be downsized and the cost can be reduced.

【Example】

An embodiment of the present invention will be described below with reference to the drawings. First
1 is a perspective view in which a part of a two-dimensional image pickup device according to an embodiment of the present invention is cut away, FIG. 2 is a schematic front view and a plan view of the two-dimensional image pickup device, and FIG. And a perspective view showing relative position detecting means of the filter replacement carriage, FIG. 4 is a block diagram showing absolute position detecting means of the element moving carriage, and FIG. 5 is a block diagram showing a schematic configuration of FIG. The same or corresponding portions as those in FIGS. 7 to 9 are designated by the same reference numerals, and duplicate description will be omitted. In the figure, 2a and 2b are guide rails composed of a pair of round bars arranged at parallel and spaced positions, and the element moving carriage 3 is movably supported on these guide rails 2a and 2b through bearings 4a and 4b. Has been done. Reference numeral 19 denotes a flat plate-shaped filter which is disposed between the element moving carriage 3 and the optical system 18 (see FIG. 5), and which is driven in parallel with the element moving carriage 3 in the same direction as the filter replacement. The carriage for filter replacement 19 has a red filter 20, a green filter 21, a blue filter 22, and a black and white filter 23, which are arranged at constant intervals in the width direction. Reference numeral 25 denotes a one-dimensional image pickup device mounted on the element moving carriage 3 and sub-scanned, and 26 is mounted on the element moving carriage 3 together with the one-dimensional image pickup element 25, and the element moving carriage 3 and the filter are exchanged. For carriage 19
Relative position detecting means for detecting the relative position of the filter 26a is a detection fin of the relative position detecting means 26, and is attached to the filter replacement carriage 19. 27 is a voice coil fixed to both ends of the element moving carriage 3, 28 is arranged on both ends of the element moving carriage 3, and intersects with the voice coil 27 to drive the element moving carriage 3. The yoke 29 of the constituent magnetic circuit is a permanent magnet fixed to the yoke 28.
29 and the voice coil 27 constitute a linear motor M1 that drives the element moving carriage 3 in the sub-scanning direction of the one-dimensional image pickup element 25. Reference numeral 30 is a rail supporting member provided on the yoke 28, 31 is a guide rail made of a round bar supported by the rail supporting member 30, and both ends of the filter replacement carriage 19 can be moved to the guide rail 31. Supported by. Reference numeral 34 is a voice coil for exchanging a color filter. The voice coil 34 is wound around a yoke of one magnetic circuit 28 which is a drive source of the element moving carriage 3 and crosses the magnetic field of the permanent magnet 29. A part of the linear motor M1 is configured to drive the filter replacement carriage 19. Reference numeral 35 denotes an optical sensor as an absolute position detecting means for detecting the absolute position of the element moving carriage 3 and the fixed side.
For example, as shown in FIGS. 4 and 5, 35 is a light source 36 such as a light emitting diode attached to the element moving carriage 3 side, and a pinhole arranged in front of the light source 36 for narrowing down the irradiation light of the light source 36. A diaphragm plate 37 having such holes is provided, and a reflecting mirror 38 and a lens 39 arranged in front of the light source 36 through the diaphragm plate 37, respectively. Reference numeral 40 denotes a position detection circuit for inputting a light detection signal from the optical sensor 35 to detect the absolute position of the element moving carriage 3, and 41 denotes an absolute position detection signal from the position detection circuit 40 and a command signal b. A controller which sends a control current as a result of inputting and comparing the signals to the voice coil 27 of the three carriages for moving the element, and 42 inputs the input signal from the relative position detecting means 26 and the command signal a. A controller for comparing and supplying a control current corresponding to the comparison value to the voice coil 34 of the filter exchange carriage 19 system. Next, the operation will be described. When an electric current is applied from the controller 41 to the voice coil 27 of the element moving carriage 3 in the magnetic field of the permanent magnet 29,
In the voice coil 27, the driving force of the element moving carriage 3 is generated in the arrow A direction (or B direction) in FIG.
By this driving force, the element moving carriage 3 moves in the A direction (or B direction), and the one-dimensional image pickup device 25 is sub-scanned. During this sub-scanning, when the light sensor 35 detects the light emitted from the light source 36 via the diaphragm plate 37, the reflecting mirror 38, and the mirror 39, the detection signal is input to the position detection circuit 40 and the element moving carriage 3 Is detected and the controller 41 inputs the detection signal, the controller 41 compares the input signal from the position detection circuit 40 and the command signal b, and the current to be passed through the voice coil 27. The amount is determined, and a current commensurate with that is applied to the voice coil 27. As a result, the element moving carriage 3 is moved in the width direction by a distance corresponding to the amount of current by the command signal b, and the one-dimensional image pickup element 25 is positioned in the sub-scanning direction. Further, even in the filter replacement carriage 19, when a current is applied to the color filter replacement voice coil 34 in the magnetic field of the magnetic circuit 28 from the controller 42 (see FIG. 5) of the system, the voice is replaced. The force generated in the coil 34 becomes the driving force of the filter replacement carriage 19 and the filter replacement carriage 19 moves in the sub-scanning direction, whereby various color filters 20 to 23 are switched and replaced. Therefore, the magnetic circuit 28 functions as a drive source for driving both the element moving carriage 3 and the filter exchanging carriage 19. Even in the case of the filter replacement carriage 19, the controller of that system is used.
Reference numeral 42 compares the input signal from the relative position detecting means 26 with the command signal a to determine the amount of current flowing through the voice coil 34,
The relative position between the filter replacement carriage 19 and the element moving carriage 3 is controlled by the command signal a corresponding to the amount of current, whereby the color filters 20 to 23 are switched. Then, when the element moving carriage 3 is scanned in response to the command signal b, a current is applied to the voice coil 34 of the system so as to maintain the relative position in accordance with the command signal a. Element moving carriage 3
And the filter replacement carriage 19 are held at appropriate relative positions. Thus, the absolute position of the element moving carriage 3 is detected by the optical sensor 35 in a non-contact manner, and the relative position detecting means 26 makes the relative position between the element moving carriage 3 and the filter exchanging carriage 19. Is detected and the controller 42 of that system controls the filter replacement carriage 19 to perform highly accurate positioning and sub-scanning of the element moving carriage 3. FIG. 6 shows another embodiment. In this embodiment, the voice coil 34 for exchanging the color filter is simply crossed with the magnetic field of the element driving magnetic circuit 28 on the side opposite to that of FIG. Is the same as. The color filter replacement voice coil 34 may be wound around the respective yokes of the magnetic circuits 28 on both sides. In this case, the filter replacement carriage 19 is driven on both sides, so that the driving is smoother. To be done.

【The invention's effect】

As described above, according to the present invention, since the element moving carriage and the filter exchanging carriage use the common magnetic circuit as the drive source, the element moving carriage and the filter exchanging carriage are individually separated as in the conventional case. Since it is not necessary to provide a dedicated magnetic circuit for driving each, there is an effect that the entire device can be downsized and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a two-dimensional image pickup device according to an embodiment of the present invention, FIG. 2 is a schematic front view and a plan view of the two-dimensional image pickup device, and FIG. FIG. 4 is a perspective view showing relative position detecting means of the carriage for filter and filter replacement carriage, FIG. 4 is a block diagram showing absolute position detecting means of the element moving carriage, and FIG. 5 is a block diagram showing a schematic configuration of FIG. FIG. 6 is a perspective view showing another embodiment, and FIG.
FIG. 8 is a perspective view showing a conventional two-dimensional image pickup device, and FIG.
FIG. 9 is an exploded perspective view of the element moving carriage and guide rail in the figure, and FIG. 9 is a sectional view showing the set state of FIG. In the figure, 3 is an element moving carriage, 18 is an optical system,
19 is a filter replacement carriage, 20 to 23 are color filters,
25 is a one-dimensional image pickup device, 27 is a voice coil for driving the device,
28 is a magnetic circuit for driving the carriage, and 34 is a voice coil for replacing the color filter. In the drawings, the same reference numerals indicate the same or corresponding parts.

Front page continuation (72) Inventor Takashi Yumura 8-1-1 Tsukaguchihonmachi, Amagasaki City, Hyogo Sanryo Electric Co., Ltd. Applied Equipment Research Laboratory (56) Reference JP-A-61-144962 (JP, A) JP Shown 61-232764 (JP, A) Actually opened 63-179771 (JP, U)

Claims (3)

[Claims] 1. An optical system for picking up an image of a subject on an image forming surface,
Between the optical system and the one-dimensional image sensor, a one-dimensional image sensor mounted at a position corresponding to the optical system is mounted, and the element moving carriage is movably supported in the sub-scanning direction of the one-dimensional image sensor. At movably supported in the sub-scanning direction, and a filter replacement carriage equipped with various color filters, and arranged on both sides of the element moving carriage,
A magnetic circuit for driving a carriage, which is formed of a rectangular iron core so as to surround each permanent magnet, and is provided so as to interlink with magnetic force lines wound around each of the iron cores and generated from each of the permanent magnets. An element moving voice coil that generates a driving force of the element moving carriage when energized and a magnetic field line generated from the corresponding permanent magnet that is wound around at least one of the iron cores are provided. And a voice coil for color filter exchange that generates a driving force of the filter exchange carriage when energized. 2. The two-dimensional image pickup apparatus according to claim 1, wherein the element moving carriage is provided with relative position detecting means for detecting a relative position with respect to the filter replacing carriage. . 3. The element moving carriage comprises non-contact type absolute position detecting means for detecting an absolute position with respect to a fixed side,
The absolute position detecting means is composed of a light source provided on the element moving carriage and an optical sensor for receiving the light from the light source and detecting the absolute position of the pushing element moving carriage. The two-dimensional image pickup device according to claim 1 or 2.