JPH1082941A - Driving device for optical parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate backlash between a holding frame and a supporting shaft so as to eliminate the occurrence of vibration occurring at the time when optical parts held by the holding frame move. SOLUTION: An every pressing member 11 is attached into the hole 4 of one supporting part 3 of the holding frame 1 movably supported by the supporting shafts 12 and 12, and presses the gap between the frame 1 and the shafts 12 and 12 to each other in the direction orthogonally crossing the optical axis of the optical parts 10. Since the backlash of the frame 1 is eliminated by the pressing force of the member 11, the vibration is prevented from occurring on the parts 10 in the case the frame 1 moves along the shafts 12 and 12, so that fluctuation is prevented from occurring on an image on an output image plane by the vibration of the parts 10 and a clear image without the fluctuation can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical component driving device for moving an optical component such as a lens for zooming and focusing.

[0002]

2. Description of the Related Art Conventionally, optical component driving devices as shown in FIGS. 5 to 8 have been used to move optical components such as lenses for the purpose of zooming and focusing.
That is, this optical component driving device includes a holding frame 21 that holds an optical component 30 such as a lens, and a pair of support shafts 3 that support the holding frame 21 movably in the optical axis direction of the optical component 30.
2, 32, a moving means 35 for moving the holding frame 21 along the support shafts 32, 32, and a biasing member for relatively biasing between the holding frame and the support shaft.

The holding frame 21 is formed in a disc shape, and has a mounting hole 22 penetrating in the axial direction at the center thereof.
The optical component 30 such as a lens is fixed in the mounting hole 22 by an appropriate means. One supporting portion 23 having a hole 24 penetrating in the optical axis direction of the optical component 30 at the center, and an optical component The other support portion 26 having the U-shaped groove 27 penetrating in the optical axis direction of the component 30 is provided integrally with each other.

The optical axis of an optical component 30 having both ends fixed to a base frame (not shown) is provided in a hole 24 of one support portion 23 of the holding frame 21 and a U-shaped groove 27 of the other support portion 26. Each of a pair of support shafts 32, 32 parallel to the above is inserted, and the holding frame 21 is supported by the support shafts 32, 32 so as to be movable only in the optical axis direction of the optical component 30.

A pair of guide plates 28, 2 are provided on the outer peripheral surface of one support portion 23 of the holding frame 21 at predetermined intervals in the axial direction.
8 are connected, and between the guide plates 28, 28, the optical component 3
A guide shaft 29 is provided so as to be parallel to the optical axis 0, and a moving piece 39 of a moving unit 35 described later is fixed to the guide shaft 29.

The moving means 35 includes a fixed base 36 attached to a base frame (not shown), and the fixed base 36
A screw rod 37 rotatably mounted so as to be parallel to the optical axis 0, and a fixed base 36,
It has a stepping motor 38 to which a rotating shaft (not shown) is integrally connected to the screw rod 37, a screw hole (not shown) for screwing with the screw of the screw rod 37, and a fitting into which the guide shaft 29 is fitted. And a moving piece 39 having a mating hole (not shown).
As the 7 rotates, the moving piece 39 moves on the screw bar 37 in the optical axis direction of the optical component 30 in accordance with the rotation of the screw bar 37.

When the stepping motor 38 of the moving means 35 is started, the screw rod 37 rotates in accordance with the rotation of the stepping motor 38 and the moving piece 39 moves on the screw rod 37 in accordance with the rotation of the screw rod 37. Optical component 3
It moves in the optical axis direction of 0. Then, following the movement of the moving piece 39, the holding frame 21 moves on the support shafts 32, 32 in the optical axis direction of the optical component 30 via the guide shaft 29, the guide plates 28, 28, and one of the support portions 23. I do.

When the stepping motor 38 is stopped, the rotation of the screw bar 37 is stopped, and the moving piece 39 stops at a predetermined position on the screw rod 37, and moves to a position corresponding to the stop position of the moving piece 39. The holding frame 21 stops, and zooming and focusing of the optical component 30 are completed.

In the optical component driving device having the above-described structure, there is a slight gap between the support portions 23, 26 of the holding frame 21 and the support shafts 32, 32 inserted therethrough. There is play, and when the holding frame 21 is moved by the play, vibration occurs in the optical component 30. And this vibration causes the image on the output screen to fluctuate,
Conventionally, since the image sensor is large and the optical system has a relatively low magnification, the image fluctuation does not become conspicuous on the output screen, and there is no practical problem.

However, in recent years, downsizing of an image sensor has been
Since a clearer image can be obtained with an increase in the magnification of the optical system, even if the holding frame 21 has some backlash,
Due to the vibration of the optical component 30 caused by the backlash, the fluctuation of the image output on the output screen becomes noticeable. Therefore, it is necessary to eliminate this image fluctuation by some method.

The present invention has been made to solve the above-mentioned problems of the prior art, and eliminates the backlash of the holding frame so that when the holding frame is moved for the purpose of zooming and focusing, the holding frame is moved. This completely eliminates the occurrence of vibration of optical components due to backlash, thereby completely eliminating the occurrence of image fluctuations on the output screen, and is also sufficient for miniaturizing image sensors and increasing the magnification of optical systems in recent years. It is an object of the present invention to provide a driving device for an optical component capable of coping with the above.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a holding frame for holding an optical component such as a lens, and the holding frame is movable in the optical axis direction of the optical component. In an optical component driving device including a support shaft for supporting and a moving unit for moving the holding frame along the support shaft, an urging member is provided on a supporting portion of the holding frame, and the urging member provides the urging member. Means is adopted in which a space between the holding frame and the support shaft is urged in a direction orthogonal to the optical axis of the optical component. A holding frame that holds an optical component such as a lens and has a support portion facing the optical axis direction of the optical component at an opposing position; and holding the holding frame through the support portion in the optical axis direction of the optical component. A support shaft movably supported by, and connected to a part of the holding frame,
In an optical component driving device comprising: a moving unit configured to move the holding frame along the support shaft, an urging member is provided in at least one of the support portions of the holding frame, and the holding frame is provided by the urging member. Means for urging the space between the optical axis and the support shaft in a direction perpendicular to the optical axis of the optical component. Furthermore, while providing a hole facing the optical axis direction of the optical component in one support portion of the holding frame,
The other support portion is provided with a U-shaped groove facing the optical axis direction of the optical component, the support shaft is inserted into the hole and the U-shaped groove, and an urging member is provided between the hole and the support shaft, Means is employed in which the urging member urges between the hole and the support shaft in a direction orthogonal to the optical axis of the optical component.

[0013]

According to the present invention, by employing the above-described means, the urging member provided on the support portion of the holding frame allows the urging member provided between the holding frame and the support shaft to extend in a direction perpendicular to the optical axis of the optical component. You can be energetic. Therefore, play of the holding frame with respect to the support shaft is eliminated, and when the holding frame is moved along the support shaft, vibration of the optical component due to play of the holding frame does not occur. In addition, even when the biasing member is provided in at least one of the support portions of the holding frame, the space between the holding frame and the support shaft can be biased in a direction orthogonal to the optical axis of the optical component. The play of the holding frame with respect to the support shaft is eliminated, and when the holding frame is moved along the support shaft, the vibration of the optical component due to the play of the holding frame does not occur. Further, a hole is provided in one of the support portions of the holding frame, and a U-shaped groove is provided in the other support portion. A support shaft is inserted into each of the holes and the U-shaped groove, and a hole is provided between the hole and the support shaft. Even when a biasing member is provided, between the hole and the support shaft,
That is, since it is possible to urge the space between the holding frame and the support shaft in a direction orthogonal to the optical axis of the optical component, there is no play on the support shaft of the holding frame, and when moving the holding frame along the support shaft, The optical component does not vibrate due to the play of the holding frame.

[0014]

Embodiments of the present invention shown in the drawings will be described below. 1 to 4 show an embodiment of an optical component driving device according to the present invention. FIG. 1 is a schematic perspective view showing the whole, and FIG. 2 is a cross-sectional view of a holding frame shown in FIG. FIG. 3 is a sectional view taken along the line AA of FIG. 2, and FIG. 4 is an enlarged view of a portion X in FIG.

That is, the optical component driving device shown in this embodiment has a holding frame 1 for holding an optical component 10 such as a lens, and a pair of supporting frames 1 for supporting the holding frame 1 movably in the optical axis direction of the optical component 10. A moving means 15 for moving the holding frame 1 along the supporting shafts 12, 12; and a direction perpendicular to the optical axis of the optical component 10 between the holding frame 1 and the supporting shafts 12, 12. And an urging member 11 for urging the member.

The holding frame 1 has a disk shape,
A mounting hole 2 penetrating in the axial direction is formed at the center thereof, and an optical component 10 such as a lens is provided in the mounting hole 2.
Are fixed by appropriate means. One supporting portion 3 having a hole 4 penetrating in the optical axis direction of the optical component 10 at the center and a light at the center at positions opposed to each other about the optical axis of the optical component 10 on the outer peripheral side of the holding frame 1. The other support portions 6 having U-shaped grooves 7 penetrating in the axial direction are provided integrally with each other.

An opening 5 extending in the axial direction penetrating through the inside and outside of the hole 4 is formed in a part of the one support portion 3 except for both ends. A biasing member 11 to be described later is mounted therein.

The portion corresponding to the opening 5 in the hole 4 of the one supporting portion 3 of the holding frame 1 is formed one step deeper than the other portion, and the bottom of the deeply formed portion has the opening 5 formed therein. A plate-shaped urging member 11 formed to have a width and length slightly smaller than the width and length is mounted.

Then, as described above, the urging member 11 is mounted in the hole 4 of the one support portion 3, and the urging member 11 is
By inserting a support shaft 12 described later into the hole 4 with the inside of the optical component 10, the space between the holding frame 1 and the support shafts 12, 12 is urged in a direction orthogonal to the optical axis of the optical component 10. It is.

The biasing member 11 is made of a material having a spring property, for example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT).
Although a synthetic resin material such as is used, the present invention is not limited to this, and other synthetic resin materials, metal materials, and the like may be used as long as they have spring properties. The number of the urging members 11 is not limited to one, and a plurality of the urging members 11 may be provided.

In the hole 4 of the one support portion 3 of the holding frame 1 and in the U-shaped groove 7 of the other support portion 6, the light of the optical component 10 whose both ends are fixed to a base frame (not shown). Each of a pair of support shafts 12, 12 parallel to the shaft is inserted, and the holding frame 1 is supported by the support shafts 12, movably only in the optical axis direction of the optical component 10.

A pair of guide plates 8 are provided at one support portion 3 of the holding frame 1 at predetermined intervals in the axial direction, and the optical axis of the optical component 10 is provided between the guide plates 8. A guide shaft 9 is installed so as to be parallel to the guide shaft 9, and a moving piece 19 of a moving unit 15 described later is fitted to the guide shaft 9.

The moving means 15 includes a fixed base 16 attached to a base frame (not shown), and the fixed base 16
A screw rod 17 rotatably mounted so as to be parallel to the optical axis 0, and a fixing base 16;
A stepping motor 18 having a rotating shaft (not shown) connected to one end of the screw rod 17, a screw hole (not shown) for screwing with the screw of the screw rod 17, and a fitting for fitting to the guide shaft 9. A moving piece 19 having a hole (not shown).
Is rotated, and the moving piece 19 moves on the screw rod 17 in the optical axis direction of the optical component 10 in accordance with the rotation of the screw rod 17.

Next, the operation of the above-described device will be described. First, when the stepping motor 18 of the moving means 15 is started, the screw rod 17 rotates according to the rotation of the stepping motor 18 and the moving piece 19 moves on the screw rod 17 according to the rotation of the screw rod 17. In the direction of the optical axis. Then, following the moving piece 19, the holding frame 1 and the optical component 10 move on the support shafts 12 and 12 via the guide shaft 9, the guide plates 8 and Move in the direction.

When the stepping motor 18 is stopped, the rotation of the screw rod 17 is stopped, and the moving piece 19 is stopped at a predetermined position on the screw rod 17, and is moved to a position corresponding to the stop position of the moving piece 19. The holding frame 1 and the optical component 10 stop, and the zooming and focusing of the optical component 10 are completed.

In the optical component driving apparatus according to this embodiment configured as described above, the urging member 11 is provided in the hole 4 of the one support portion 3 of the holding frame 1.
Between the holding frame 1 and the support shafts 12 and 12 by the urging force of the urging member 12. Can be urged in a direction orthogonal to the optical axis of

Therefore, the distance between the hole 4 of one support 3 and the support shaft 12 passing therethrough and the U of the other support 6
It is possible to eliminate backlash formed between the groove 7 and the support shaft 12 passing therethrough. As a result, when the holding frame 1 and the optical component 10 are moved along the support shafts 12, 12, the optical component 10 does not vibrate, and the image output on the output screen may be shaken. Disappears.

The urging force of the urging member 11 is
Since there is no change when the (optical component 10) is moved, a stable effect can be obtained within the entire moving range, and such a stable effect can be obtained for a long period of time.

Further, the urging member 11 has a width, a length,
Since the urging force can be changed by changing the thickness, the urging force of the urging member 11 can be set to a value corresponding to the type of the optical component 10, and versatility is improved.

The urging member 11 is a plate made of a synthetic resin material such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), so that the manufacturing is simple and the manufacturing cost is reduced. And can provide cheap ones.

The urging member 11 is provided on one of the support portions 3.
Since it is sufficient to simply mount the device in the hole 4, the labor required for assembly is reduced, and the maintenance is facilitated.

In the above description, a hole 4 is provided in one support 3 of the holding frame 1 and a U-shaped groove 7 is provided in the other support 6.
And the urging member 11 is interposed between the hole 4 of the one support portion 3 and the support shaft 12 inserted therethrough. However, a hole is provided in both the support portions 3 and 6, and at least one of the support portions 3 and 6 is provided. An urging member 11 may be interposed between the holes of the support portions 3 and 6 and the support shafts 12 inserted therethrough.

[0033]

According to the present invention having the above-described structure, the following effects can be obtained. That is, the biasing member provided on the support portion of the holding frame can bias the space between the holding frame and the support shaft in a direction orthogonal to the optical axis of the optical component. It is possible to eliminate backlash occurring between the two. Therefore, when the holding frame is moved along the support axis, vibration does not occur in the optical component, so that the image output on the output screen does not shake due to the vibration of the optical component, It is possible to sufficiently cope with recent miniaturization of an image sensor and high magnification of an optical system, and it is possible to provide a clear image without image fluctuation.

Also, by providing the urging member in at least one of the support portions of the holding frame, the urging force of the urging member allows the space between the holding frame and the support shaft to be orthogonal to the optical axis of the optical component. Can be energized. Therefore, the play between the holding frame and the support shaft can be completely eliminated, and the vibration of the optical component caused by the play of the holding frame can be prevented. As a result, the image output on the output screen does not fluctuate, and it is possible to sufficiently cope with the recent miniaturization of the image sensor and the high magnification of the optical system. It is possible to provide a perfect image.

Further, by providing an urging member in the hole of one of the support portions of the holding frame, the biasing member is provided between the hole of the one of the support portion and the support shaft inserted therethrough, ie, between the support frame and the support shaft. The space can be urged in a direction orthogonal to the optical axis of the optical component. Therefore, it is possible to completely eliminate the play between the hole of one support portion and the support shaft and between the U-shaped groove of the other support portion and the support shaft, and when the holding frame moves along the support shaft. The play of the holding frame can be completely eliminated. As a result, the optical components do not vibrate due to the play of the holding frame, so that the image on the output screen does not fluctuate. Therefore, it is possible to provide a clear image with no image fluctuation.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an entire embodiment of an optical component driving device according to the present invention.

FIG. 2 is a cross-sectional view of a holding frame shown in FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is an enlarged view of a portion X shown in FIG.

FIG. 5 is a schematic perspective view showing the whole of an example of a conventional optical component driving device.

FIG. 6 is a cross-sectional view of the holding frame shown in FIG.

FIG. 7 is a sectional view taken along the line BB of FIG.

FIG. 8 is an enlarged view of a portion Y shown in FIG. 7;

[Explanation of symbols]

 1, 21 holding frame 2, 22 mounting hole 3, 23 one support portion 4, 24 hole 5 opening 6, 26 other support portion 7, 27 U-shaped groove 8, 28 Guide plate 9, 29 Guide shaft 10, 30 Optical component 11 Biasing member 12, 32 Support shaft 15, 35 Moving means 16, 36 Fixed Tables 17, 37 Screw rods 18, 38 Stepping motors 19, 39 Moving frame

Claims (3)

[Claims] 1. A holding frame for holding an optical component such as a lens, a support shaft for movably supporting the holding frame in the optical axis direction of the optical component, and moving the holding frame along the support shaft. In a driving device for an optical component having moving means, a biasing member is provided at a support portion of the holding frame, and the biasing member causes a space between the holding frame and the support shaft to be orthogonal to the optical axis of the optical component. A driving device for an optical component, wherein the driving device is configured to be urged in a direction in which the optical component is driven. 2. A holding frame that holds an optical component such as a lens and has a support portion facing the optical axis direction of the optical component at an opposing position, and the holding frame is connected to the optical component via the support portion. A support shaft movably supported in the optical axis direction,
A driving device for an optical component, the driving device being connected to a part of the holding frame and moving means for moving the holding frame along the support shaft; An optical component driving device, comprising a biasing member, wherein the biasing member biases the space between the holding frame and the support shaft in a direction orthogonal to the optical axis of the optical component. 3. A holding frame is provided with a hole in one of the support portions facing the optical axis direction of the optical component, and the other support portion is provided with a U-shaped groove in the optical axis direction of the optical component. Each of the support shafts is inserted into the U-shaped groove, and an urging member is provided between the hole and the support shaft, and the urging member moves a space between the hole and the support shaft at right angles to the optical axis of the optical component. 3. The optical component driving device according to claim 2, wherein the optical component driving device is biased.