JP3653768B2 - Linear movement mechanism and image input apparatus using the linear movement mechanism - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a linear moving mechanism applied to a moving unit such as a precision instrument and an image input apparatus using the linear moving mechanism.
[0002]
[Prior art]
There are the following techniques related to a conventional linear movement mechanism and an image input apparatus using the linear movement mechanism.
[0003]
(1) When a moving member is moved linearly in a moving part of a precision instrument or the like, for example, as disclosed in Japanese Patent Laid-Open No. 05-281818, a rod member having a male screw part by rotation of a motor In some cases, a slider member having a female threaded portion that meshes with a male threaded portion engages with a parallel axis parallel to the rod member and moves linearly. Further, with reference to the configuration explanatory diagram of the linear movement mechanism of the conventional example shown in FIG. 7, the rod member 95 having the male screw portion is rotated by the rotation of the motor 91 attached to the main plate 92, and the female screw meshing with the male screw portion is obtained. There is a slider member 94 having a portion and fitted on a parallel shaft 93 parallel to the rod member 95. The slider member 94 is moved by the rotation of the rod member 95, and the moved member is moved linearly by the slider member 94. However, it has been found that if the rod member 95 and the parallel shaft 93 are not parallel, the movement of the slider portion becomes unsmooth and further the motor rotation load increases.
[0004]
As another example, a rotating rod member has a first male screw portion and a second male screw portion in the same direction with different pitches, and a member of a first female screw that meshes with the first male screw is a fixing member. There is a slider member that has a second female screw portion that is fixed to the second male screw and meshes with the second male screw. However, it has been found that if the slider member does not move in parallel with the groove of the fixing member parallel to the rod member, the movement of the slider portion becomes unsmooth, and the load required for rotation increases.
[0005]
In addition, (2) when the moving member is moved linearly in a moving part such as a precision device, the slider part is moved by rotating the rod member by the motor rotation, and the operating point of the slider part for moving the moving member. However, there are some which are greatly deviated from the central axis of the rod member. However, it has been found that there is a problem that the rotational load of the motor increases if there is a large deviation.
[0006]
Furthermore, (3) the present inventors previously described in Japanese Patent Application No. 6-025024 as an image input device using a linear movement mechanism, a parallel plane transparent plate is provided in the imaging optical system, and a screw is rotated by a motor. An application has been filed in which a parallel plane transparent plate is tilted by linear movement to shift a pixel of a solid-state imaging device (CCD). Further research has shown that the linear movement mechanism of the pixel-shifted tilt mechanism can be further improved.
[0007]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION An object of the present invention is to solve at least one of the above-described problems. A simple, inexpensive and highly accurate linear moving mechanism, a highly accurate linear moving mechanism with less motor load, and a linear moving mechanism are provided. An object of the present invention is to provide an image input device used for pixel shifting of a solid-state imaging device.
[0008]
[Means for Solving the Problems]
The above object can be achieved by the following means. That is,
(1) A main body, a motor attached to the main body, a first female thread portion provided on the main body, a rotating shaft of the motor , and a first male thread portion having the same direction with a different pitch. a rod member that linearly moves the first male threaded portion which engages with the first internally threaded portion has two male screw portion and the guide portion, the guide receiving portion fitted to said guide portion of said rod member, said first a second female threaded portion to be screwed and 2 male thread portion, and a slider member that linearly moves at a pitch difference of the first male screw portion and the second male threaded portion, you restrict rotation of the front Symbol slider member and part material, a linear movement mechanism, characterized in that it comprises a.
[0009]
(2) The linear moving mechanism according to (1), wherein the action point between the slider member and the moved member is provided in the vicinity of the central axis of the rod member. It is.
[0017]
【Example】
Embodiments of the present invention will be described with reference to the drawings.
[0018]
(Example 1)
The embodiment is a linear movement mechanism used as a mechanism for moving a lens unit of a still camera in a straight line with high accuracy.
[0019]
FIG. 1 is a linear movement mechanism diagram of an embodiment of the present invention. (A) is side surface sectional drawing, (b) is AA sectional drawing of (a). A motor 30 is attached to the main body 20 of the still camera. When the motor rotates, the rod member 40 having the guide portion 44 and the external thread portion 41 rotates. On the other hand, the slider member 50 having the guide receiving portion 54 fitted to the guide portion 44 and the female screw portion 55 fitted to the male screw portion 41 moves linearly as the rod member 40 rotates. The moved member 61 has a slider detent fitting portion 60, is guided by a guide shaft 64, has a lens 701, and moves linearly with high accuracy by the movement of the slider member 50. As described above, the rod member is integrated with the guide member and the female screw portion, so that the accuracy is improved and the sliding is smooth. Further, it is not necessary to obtain the parallelism between the rod member and the parallel shaft provided in parallel with the rod member as shown in FIG. 7, and a simple, inexpensive and highly accurate linear movement mechanism can be obtained.
[0020]
Although the lens unit of the still camera was used for the mechanism that moves linearly, a parallel plane transparent plate is provided in the imaging optical system, the motor is moved and the screw is rotated to tilt the parallel plane transparent plate by linear movement. Thus, it may be used for linear movement in which pixels of a solid-state imaging device (CCD) are shifted.
[0021]
(Example 2)
The embodiment is another linear moving mechanism used for a linear moving mechanism such as a camera.
[0022]
FIG. 2 is another linear movement mechanism diagram of the embodiment of the present invention. (A) is a top view, (b) is a side view. The same parts as those in FIG. The main plate 21 having the slider detent fitting portion 60 is fixed to the main body 20, and the motor 30 is attached to the main plate 21, and when the motor 30 rotates, the rod member 40 having the guide portion 44 and the external thread portion 41 rotates. To do. The tip of the rod member 40 is received by a thrust bearing 22. On the other hand, the slider member 50 having the threaded portion 55 that is pressed by the guide receiving portion 54 fitted to the guide portion 44 and the leaf spring 62 fitted to the male threaded portion 41 moves linearly by the rotation of the rod member 40. . The member to be moved (not shown) is linearly moved by the slider member 50. As described above, rattling of the threaded portion can be prevented by pressing the spring, resulting in high accuracy. Further, it is not necessary to obtain parallelism between the rod member and the parallel axis as shown in FIG. 7, so that a simple and inexpensive linear moving mechanism is obtained.
[0023]
Although the lens unit of the still camera was used for the mechanism that moves linearly, a parallel plane transparent plate is provided in the imaging optical system, the motor is moved and the screw is rotated, and the parallel plane transparent plate is tilted by linear movement. Thus, the pixel shift of the solid-state imaging device (CCD) may be used for linear movement.
[0024]
(Example 3)
The embodiment is a linear movement mechanism used as a mechanism for linearly moving a pixel shifting mechanism of an electronic still camera.
[0025]
FIG. 3 is a linear movement mechanism diagram of the embodiment of the present invention. A base plate 21 is fixed to the main body 20, and the base plate 21 has a pin 24 that fits with a rotation preventing portion of the slider member 51, and a motor 30 is attached thereto. The rod member 401 includes a first male screw portion 42, a second male screw portion 43, and a guide portion that are fitted to the first female screw 56 fixed to the base plate 21. The second male screw portion 43 has a pitch different from that of the first male screw portion 42 in the same direction. Accordingly, a slider member described later is moved slightly by the pitch difference between the first male screw portion 42 and the second male screw portion 43. The rod member 401 is rotated by the motor 30 and linearly moves by the first female screw portion 56 fixed to the main plate 21. Incidentally, the rotor of the motor is adapted to be slid while rotating fitted to the rod member 40 1. The slider member 51 has a second female thread 57 that fits into the second male threaded portion 43 of the rod member, and moves linearly, and the movable member indicated by the two-dot chain line in the figure by the ball at the tip of the slider member on the central axis of the rod member. Press to move. By this movement, the pixel shifting mechanism of the electronic still camera is moved linearly by the method described in the fifth embodiment described later.
[0026]
As described above, since the moved member is moved on the central axis of the rod member, an excessive load is not generated between the rod member and the slider member, so that the motor can be smoothly rotated. Further, it is not necessary to obtain the parallelism between the rod member and a parallel axis parallel to the rod member as shown in FIG. 7, so that a simple and inexpensive high-precision linear movement mechanism is obtained.
[0027]
(Example 4)
The embodiment is another linear movement mechanism used as a mechanism for linearly moving a pixel shifting mechanism or the like of an electronic still camera.
[0028]
FIG. 4 is another linear movement mechanism diagram of the embodiment of the present invention. (A) is a top view, (b) is a front view. The same parts as those in FIG. 3 are given the same names and the same symbols, and a part of explanation is omitted.
[0029]
The main plate 21 is fixed to the main body, and the motor 30 is attached to the main plate 21. The rod member 402 has a male screw portion 412 and a guide receiving portion 541 and is rotated by the motor 30. On the other hand, the slider member 501 moves linearly by the female screw portion 551 as the rod member 402 rotates. The moved member 611 is moved at the action point 63 via the ball 23 in the vicinity of the central axis of the rod member by linear movement. By this movement of the member 611 to be moved, the pixel shifting mechanism of the electronic still camera is moved linearly by the method described in Example 5 described later. The slider member 501 prevents the slider member from rotating by the pin 25 fixed to the flange 26 and the pin 24 sandwiched by the biasing member 621.
[0030]
FIG. 5 is another main part linear movement mechanism diagram of the present invention. (A) is principal part sectional drawing, (b) shows the AA cross section of (a). In the modification of FIG. 4, a motor (not shown) rotates a rod member 403 having a male screw portion 413 and a guide portion 443. On the other hand, the slider member 502 has a female screw portion 552 that fits into the male screw portion, and a guide receiving portion 542 that fits with the guide portion, and moves linearly as the rod member 403 rotates. The rotation stop of the slider member 502 is omitted. By this linear movement, the moved member 611 is moved through the ball 23 at the tip. A hole 58 is formed in the slider member 502, and this hole facilitates processing of the internal thread portion and facilitates processing of thread cutting chips and the like. Furthermore, since the accuracy of internal thread processing is difficult to achieve, the internal thread portion was shortened to eliminate the change in the accuracy of the fitting length, so that the accuracy was improved.
[0031]
As described above, since the member to be moved is moved by the ball on the central axis of the rod member, an excessive load is not generated between the rod member and the slider member, so that the motor can be smoothly rotated.
[0032]
(Example 5)
The embodiment is an image input device of an electronic still camera using a solid-state imaging device having a pixel shifting mechanism.
[0033]
FIG. 6 is a block diagram of the image input apparatus of the present invention. (A) is a top view of the imaging part of an image input device, (b) is AA sectional drawing of (a). The pin 24 is fixed to a main body (not shown). The motor 30 is also attached to the main body. When the motor rotates, the rod member having the male screw portion and the guide portion rotates (see FIG. 4). On the other hand, the slider member 503 is linearly moved by the female screw portion by the rotation of the male screw portion of the rod member, and moves the tilting means 77 of the moved member. An urging member 621 is fixed to the slider member 503. Further, the urging member 621 and the pin 24 come into contact with each other and slide, and the slider member 503 is prevented from rotating and moves without rotating. In addition, between the photographing optical system 70 and the planar imaging element 71, there is a parallel flat transparent member 73 disposed substantially parallel to the imaging surface of the imaging element in the optical path of the photographing optical system. The tilting means 77 moves the image formed on the image sensor by tilting the parallel plane transparent member with respect to the planar image sensor. Further, the tilting means 77 has three operating points 76 and 74 for selecting three points which are not on a straight line, one of which is a support part 75 and the other two points for operating the parallel plane transparent member 73. . The springs 761 and 751 are provided so as to bias the parallel plane transparent member. The storage unit 78 records each image moved by the inclination of the parallel plane transparent member, and the image forming unit 79 synthesizes a high resolution image from the image stored in the storage unit.
As described above, since the member to be moved is moved on the central axis of the rod member, an excessive load is not generated between the rod member and the slider member, and the motor can be smoothly rotated.
[0034]
【The invention's effect】
Since it comprised as mentioned above, there exist the following effects.
[0038]
According to the first aspect of the present invention, a linear movement mechanism that can perform minute movement, is simple, inexpensive, and highly accurate.
[0039]
According to the second aspect of the present invention, the rod member smoothly rotates and can be moved linearly with a low load.
[Brief description of the drawings]
FIG. 1 is a linear movement mechanism diagram of an embodiment of the present invention.
FIG. 2 is another linear movement mechanism diagram according to the embodiment of the present invention.
FIG. 3 is a linear movement mechanism diagram of the embodiment of the present invention.
FIG. 4 is another linear movement mechanism diagram according to the embodiment of the present invention.
FIG. 5 is another main part linear movement mechanism diagram of the present invention.
FIG. 6 is a configuration diagram of an image input apparatus of the present invention.
FIG. 7 is a diagram illustrating a configuration of a conventional linear movement mechanism.
[Explanation of symbols]
20 body
21 Ground plane
22 Thrust bearing
23 balls
24 pin
25 pin
26 Flange
30 motor
40, 401, 402, 403 Rod member
41, 412, 413 Male thread
42 First male thread
43 Second male thread
44, 443 Guide section
50, 501, 502, 503 Slider member
51 Slider member
54, 541, 542 Guide receiver
55,551,552 Female thread
56 First female thread
57 Second female thread
58 holes
60 Slider detent fitting part
61,611 Moved member
62 leaf spring
621 Biasing member
63 Action point
64 guide shaft
70 Shooting optics
701 lens
71 Planar image sensor
73 Parallel plane transparent member
74 Actuator
75 Support
751 spring
76 Actuator
761 spring
77 Tilting means
78 Storage means
79 Image forming means
91 Motor
92 Ground plane
93 parallel axes
94 Slider member
95 Rod member
96 Bearing

Claims (2)

A main body, a motor attached to the main body, a first female thread portion provided in the main body, and a rotation shaft of the motor; a first male thread portion and a second male screw in the same direction at different pitches A rod member that has a portion and a guide portion and moves linearly by a first male screw portion that is screwed with the first female screw portion, a guide receiving portion that fits into the guide portion of the rod member, and the second male screw a second female threaded portion which parts and screwed, a slider member that linearly moves at a pitch difference of the first male screw portion and the second male threaded portion, and the front Symbol part material you restricting rotation of the slider member A linear movement mechanism comprising: 2. The linear moving mechanism according to claim 1, wherein an action point between the slider member and the moved member is provided in the vicinity of a central axis of the rod member .

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