JP2008175962A - Optical equipment - Google Patents

Abstract

A miniaturized optical apparatus is provided.
The invention of claim 1 includes a first support part (20) for supporting a first optical system (10), a holding part (72) for holding a second optical system (L3), and the holding part. A second support portion (71) that can move relative to the first support portion in the optical axis direction of the first optical system, and the holding portion in a plane perpendicular to the optical axis. An optical apparatus comprising: a first movement mechanism (21, 72d) that moves relative to the second support part; and a second movement mechanism (22) that moves the holding part relative to the second support part in the optical axis direction. (1).
[Selection] Figure 7

Description

  The present invention relates to an optical apparatus.

An optical device such as a lens barrel is known as a so-called collapsible type in which the total length in the optical axis direction changes depending on a shooting state or the like and an accommodation state with respect to the camera body (for example, Patent Document 1). reference).
JP 2004-233916 A

In recent years, cameras tend to be smaller and thinner, and there is a demand for a lens barrel that can shorten the overall length in the accommodated state.
An object of the present invention is to provide a miniaturized optical apparatus.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this.
The invention of claim 1 supports the first support part (20) supporting the first optical system (10), the holding part (72) holding the second optical system (L3), and the holding part, A second support portion (71) movable relative to the first support portion in the optical axis direction of the first optical system; and the holding portion on the second support portion in a plane perpendicular to the optical axis. An optical instrument (1) comprising a first movement mechanism (21, 72d) that moves relative to the second support part and a second movement mechanism (22) that moves the holding part in the optical axis direction relative to the second support part; is there.

According to a second aspect of the present invention, in the optical instrument according to the first aspect, the first moving mechanism is interlocked with an approaching operation between the first support portion (20) and the second support portion (71). An optical apparatus characterized in that the first cam portion (21) provided on the first support portion is a cam mechanism that engages with the second cam portion (72d) provided on the holding portion (72). 1).
According to a third aspect of the present invention, in the optical device according to the first or second aspect, the first moving mechanism (21, 72d) is configured to move the second optical system (L3), and the optical path of the first optical mechanism (L3). The second movement mechanism (22) is moved between a first position overlapping the optical path of the system (10) and a second position where the optical path is retracted from the optical path of the first optical system. The optical device (1) is characterized in that the holding portion (72) is moved in the optical axis direction at a position of 2.
According to a fourth aspect of the present invention, in the optical device according to any one of the first to third aspects, the second moving mechanism is provided on the first support portion (20), and the first support portion is provided. In the optical device (1), which is a pressing portion (22) that presses the holding portion (72) in the optical axis direction in conjunction with an approaching operation of the portion and the second support portion (71). is there.
According to a fifth aspect of the present invention, in the optical device according to the fourth aspect, the pressing portion protrudes from the first support portion (20) toward the second support portion (71). It is an optical apparatus (1) characterized by these.
According to a sixth aspect of the present invention, in the optical device according to the fourth or fifth aspect, the first moving mechanism (21, 72d) is configured to move the second optical system (L3), and an optical path of the first optical mechanism (L3). The first position overlapping the optical path of the system (10) and the second position where the optical path is retracted from the optical path of the first optical system are driven, and the pressing portion (22) is The optical apparatus (1) is provided at a position where the holding portion (72) can be pressed when the system (L3) is at the second position.
According to a seventh aspect of the present invention, in the optical instrument according to the sixth aspect, the holding portion (72) is biased to the first position, and the holding portion is moved with respect to the second support portion (71). An optical apparatus (10) including an urging portion (73) for urging in an approaching direction.
According to an eighth aspect of the present invention, in the optical device according to any one of the first to seventh aspects, the first optical system is an image sensor (10), and the second optical system is a lens (L2). It is an optical apparatus (1) characterized by these.
Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  According to the present invention, a miniaturized optical apparatus can be provided.

Hereinafter, the present invention will be described in more detail with reference to the drawings and the like. In the following embodiments, a lens barrel will be described as an example of an optical apparatus.
The lens barrel of the embodiment is, for example, a collapsible lens barrel whose total length in the optical axis direction changes between when shooting and when not shooting. A part of the lens barrel is extended from a camera body (not shown) in the shooting state, and substantially the entire lens barrel is stored in the camera body in the non-shooting state.
FIG. 1 is a cross-sectional view including the optical axis of the lens barrel of the embodiment. In FIG. 1, (a) shows the photographing state of the lens barrel, and (b) shows the housed state.
FIG. 2 is a perspective view of the third group support portion and the CCD base provided in the lens barrel of FIG. 1 as viewed from the subject side in the optical axis direction.

The lens barrel 1 includes a first lens group L1, a second lens group L2, a third lens group L3, a fourth lens group L4, a CCD 10, a CCD base 20, a fixed cylinder 30, a movable cylinder 40, and a first lens group holding frame. 50, a second group support portion 60, a third group support portion 70, and a fourth lens group holding frame 80.
The first lens group L1, the second lens group L2, the third lens group L3, and the fourth lens group L4 form a zoom lens having a four-group structure, and have an optical axis (indicated by reference numeral A in FIG. 1). Arranged in this order from the subject side to the image side (photographer side).

  Here, when the lens barrel 1 shifts from the photographing state to the housed state, the third lens group L3 slides in a direction parallel to the imaging surface of the CCD 10 and from the optical paths of the other lens groups L1, L2, and L4. With the lens barrel 1 retracted, the fourth lens group L4 is accommodated in a space formed by retracting the third lens group L3 (see FIG. 1B). Thus, the lens barrel 1 can be shortened in the total length in the accommodated state.

  In this lens barrel 1, the slide retracting operation of the third lens unit L3 is completed while the lens barrel 1 completes the retracting operation. Then, after the third lens unit L3 finishes the slide retracting operation, the lens barrel 1 further moves the third lens unit L3 in a direction (optical axis direction) perpendicular to the imaging surface of the CCD 10 in conjunction with the retracting operation. It is designed to move. At this time, the third lens unit L3 is moved in a direction away from the CCD table 20. The slide retraction mechanism and vertical movement mechanism of the third lens unit L3 will be described in detail later.

The CCD 10 is a photoelectric conversion element that converts subject light that has passed through the lens groups L1 to L4 into an electrical signal. The CCD 10 is disposed on the emission side of the fourth lens unit L4, and a low pass filter (LPF) 11 for reducing moire is provided between the CCD 10 and the fourth lens unit L4.
The CCD table 20 is a substantially disk-shaped member that holds the CCD 10, and the CCD 10 and the LPF 11 are fixed to a substantially central portion of the CCD table 20.
The CCD table 20 includes a cam portion 21 (see FIG. 2) that drives a third lens group L3, which will be described later, from the photographing position to the retracted position when the lens barrel 1 shifts from the photographing state to the housed state. Here, the photographing position of the third lens unit L3 is the third position in a state where the optical axis of the third lens unit L3 and the optical axis A of the first lens unit L1 and the fourth lens unit L4 substantially coincide. The position of the lens group L3 shall be pointed out.

The cam portion 21 is a protrusion-like portion formed by protruding from the surface portion of the CCD table 20 facing the subject side in the optical axis direction toward the subject side in the optical axis direction. The cam portion 21 has a cam surface 21a that engages with a third lens group holding frame 72 that holds a third lens group L3, which will be described later, at the distal end portion thereof during a retraction operation.
The CCD table 20 includes a protrusion 22 that moves the third lens unit L3 in the optical axis direction in conjunction with the retracting operation of the lens barrel 1.
Similar to the cam portion 21, the protruding portion 22 is a portion formed by protruding from the surface portion of the CCD table 20 facing the subject side in the optical axis direction toward the subject side in the optical axis direction, and is provided adjacent to the cam portion 21. ing. Here, the protruding length of the protruding portion 22 is set to be shorter than the protruding length of the cam portion 21. The function of the protrusion 22 will be described in detail later.

As shown in FIG. 1, the fixed cylinder 30 is a cylinder whose end on the optical axis direction image side is fixed to the CCD table 20.
The moving cylinder 40 includes a first moving cylinder 41, a second moving cylinder 42, and a third moving cylinder 43.
The first moving cylinder 41 is a cylinder that is driven in the optical axis direction with respect to the fixed cylinder 30 by an actuator (not shown).
The second moving cylinder 42 is a cylinder housed on the inner diameter side of the first moving cylinder 41, and can be moved back and forth in the optical axis direction with respect to the first moving cylinder 41 by a cam mechanism (not shown). ing.
The third moving cylinder 43 is a cylinder housed on the inner diameter side of the second moving cylinder 42 and can be moved back and forth in the optical axis direction with respect to the second moving cylinder 42 by a cam mechanism (not shown). ing. The third moving cylinder 43 includes a lens barrier unit 44 that protects the incident surface of the first lens unit L1 at the end on the subject side in the optical axis direction when not photographing.

The first lens group holding frame 50 is an annular frame that holds the first lens group L1 on its inner diameter side, and is fixed near the end of the third moving cylinder 43 on the subject side in the optical axis direction. .
The second group support portion 60 is a portion that supports the second lens group L <b> 2 and is inserted on the inner diameter side of the third moving cylinder 43. The second group support unit 60 drives the second lens group L2 in a plane orthogonal to the optical axis A in accordance with known image blur correction control, and reduces image blur of an image formed on the imaging surface of the CCD 10. An image blur correction device is provided.

The third group support portion 70 is a portion that supports the third lens group L3, and includes a base 71, a third lens group holding frame 72, a biasing spring 73, and a shutter unit 74, as shown in FIGS. ing.
FIG. 3 is a perspective view of the third group support portion, the fourth lens group holding frame, and the CCD table provided in the lens barrel of FIG. 1 as viewed from the optical axis direction image side. FIG. 3 shows a state in which the third lens group is disposed at the photographing position.
FIG. 4 is a perspective view illustrating a state in which the third lens group is disposed at the retracted position in the third group support portion illustrated in FIG. 3.
FIG. 5 is an exploded perspective view of the third group support portion shown in FIG.
FIG. 6 is a diagram showing a positional relationship in the photographing state of the CCD table and the third group support unit shown in FIG. In FIG. 6, (a) and (b) are a side view and a plan view of the CCD base and the third group support part, respectively, and (a) is a side view of the arrow (a).
FIG. 7 is a diagram showing the positional relationship between the CCD base and the third group support unit after the lens barrel in the photographing state shown in FIG. 6 has shifted to the housed state. FIG. 7 is also a side view and a plan view of the CCD base and the third group support part, respectively, as in FIG. 6, and FIG. FIG.

The base 71 is a substantially disk-shaped member that serves as a base of the third group support unit 70.
The base 71 includes, for example, three cam follower pin mounting portions 71b on which three cam follower pins 71a (see FIG. 6) are mounted at substantially equal intervals around the outer periphery thereof. The cam follower pin 71a is inserted into a cam groove provided in a cam cylinder (not shown), and the base 71 performs an advance / retreat operation in the optical axis direction according to the rotation of the cam cylinder.

As shown in FIG. 5, the third lens group holding frame 72 is formed to have an annular frame 72 a that holds the third lens group L <b> 3 on its inner diameter side, and to protrude from the frame 72 a to the outer diameter side. Arm part 72b. A bearing 72c formed in a cylindrical shape is provided at the tip of the arm 72b.
The bearing portion 72 c has a pin P passing through the inner diameter side thereof, and is rotatably supported with respect to the base portion 71. One end of the pin P is pivotally supported by the base 71, and the other end passes through a pivotal support 71c provided integrally with the base 71 (see FIG. 6A). The bearing portion 72c of the third lens group holding frame 72 is disposed between the base portion 71 and the shaft support portion 71c.
Here, the distance between the base portion 71 and the shaft support portion 71c is set to be larger than the dimension in the optical axis direction of the bearing portion 72c of the third lens group holding frame 72, and the third lens group holding frame 72 has an optical axis. It can move in the direction.

  The third lens group holding frame 72 includes an abutting portion 72d that can abut on the cam portion 21 formed on the CCD table 20 near the tip of the arm portion 72b. The abutting portion 72d slides on the cam surface 21a of the cam portion 21 during the retracting operation of the lens barrel 1, functions as a cam follower, and rotates the third lens group holding frame 72 around the pin P. Yes. Thereby, the third lens unit L3 is moved from the photographing position to the retracted position. In this specification, the retracted position of the third lens unit L3 refers to the third lens unit L3 in a state where the optical path of the third lens unit L3 does not overlap with the optical paths of the other lens units L1, L2, and L4. Refer to the position.

The biasing spring 73 is a torsion spring that biases the third lens group holding frame 72 to the photographing position.
The bearing portion 72c and the biasing spring 73 of the arm portion 72b described above are inserted between the base portion 71 and the shaft support portion 71c, respectively, and the bearing portion 72c is disposed on the image side in the optical axis direction with respect to the biasing spring 73. (See FIG. 6A). The aforementioned pin P passes through the inner diameter side of the biasing spring 73.
Here, the urging spring 73 is a steel wire formed in a coil shape, one end of which is held by the base 71 and the other end is held by the third lens group holding frame 72. In the urging spring 73, a coiled portion formed between these end portions functions as a compression spring.
The biasing spring 73 biases the third lens group holding frame 72 toward the shaft support 71c by the portion functioning as the compression spring (see FIG. 6A). The third lens group holding frame 72 is prevented from rattling with respect to the base 71 by the pressing force of the compression spring.
In the third group support portion 70, a gap is formed between the bearing portion 72 c and the base portion 71 of the third lens group holding frame 72 when the third lens group holding frame 72 is biased toward the shaft support portion 71 c. Yes. In the following description, the distance in the optical axis direction of the gap is D1, and reference numeral D1 is attached to FIG.

The shutter unit 74 adjusts the exposure time for the CCD 10 and is provided at the end of the base 71 on the subject side in the optical axis direction.
The fourth lens group holding frame 80 is a frame that holds the fourth lens group L4. The fourth lens group holding frame 80 is driven in the optical axis direction by an actuator (not shown).

Next, the retracting operation of the lens barrel 1 will be described.
When the lens barrel 1 is in a photographing state, for example, when a power-off operation is performed, the lens barrel 1 starts a collapsing operation and shifts to the accommodated state. At this time, each of the moving cylinders 41 to 43 moves in a direction approaching the CCD table 20 by a cam function (not shown). Further, the third group support portion 70 also moves in a direction approaching the CCD table 20 during the retracting operation.

Here, when the third group support portion 70 approaches the CCD table 20, the cam portion 21 provided on the CCD table 20 contacts the contact portion 72 d formed on the third lens group holding frame 72. The three-lens group holding frame 72 moves (slides back) from the photographing position to the retracted position against the biasing force of the biasing spring 73 in the torsional direction. Further, the protruding height of the cam portion 21 is set to be larger than the protruding height of the protruding portion 22, and the retracting operation of the third lens group holding frame 72 causes the third lens group holding frame 72 and the protruding portion 22 to contact each other. Complete before you do.
The lens barrel 1 further moves in the direction in which the third group support portion 70 approaches the CCD table 20 even after the third lens group holding frame 72 has moved to the retracted position. As a result of this movement, the projection 22 provided on the CCD table 20 comes into contact with the third lens group holding frame 72, and the third lens group holding frame 72 is pressed in a direction away from the CCD table 20. As a result, the third lens group holding frame 72 approaches the base 71, and the distance between the bearing 72c and the base 71 (indicated by reference symbol D2 in FIG. 7A) is shorter than these distances D1 in the photographing state. (See FIG. 6A and FIG. 7A).

According to the lens barrel 1 of the embodiment described above, the following effects can be obtained.
(1) In conjunction with the retracting operation of the lens barrel 1, the third lens group holding frame 72 is slid and retracted, and the fourth lens group L4 is accommodated in the space formed thereby. The total length in the optical axis direction of 1 can be shortened.
At the same time, since the third lens group holding frame 72 is moved away from the CCD table 20, interference between the CCD table 20 and the third lens group holding frame 72 during the collapsing operation can be prevented. As a result, the third group support unit 70 and the CCD table 20 can be brought closer to each other.
More specifically, the lens barrel 1 according to the embodiment has a bearing portion 72c and a base portion as compared with a lens barrel that does not move the third group support portion 70 in the optical axis direction (this lens barrel is not shown). The third group support portion 70 can be brought closer to the CCD table 20 in the accommodated state by the difference (D1-D2) in the distance from 71. Therefore, the lens barrel 1 can further shorten the overall length in the optical axis direction in the accommodated state.
(2) In the mechanism for moving the third lens group holding frame 72 in the optical axis direction, the protrusion 22 provided on the CCD table 20 in conjunction with the retracting operation of the lens barrel 1 causes the third lens group holding frame 72 to move. Since it is configured to press in the optical axis direction, the structure is simple.
(3) Since the urging spring 73 causes the urging force in the torsional direction and the urging force in the compression direction to act on the third lens group holding frame 72, for example, when these urging forces are acted on by a single spring. Compared with, the structure is simple. Further, the vicinity of the bearing portion that pivotally supports the third lens group holding frame 72 can be made compact.

[Deformation]
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The configuration of the optical apparatus of the present invention is not limited to that described in the embodiment, and can be changed as appropriate. For example, the lens barrel of the embodiment drives the retracting optical system (corresponding to the third lens group of the embodiment) by directly applying a pressing force by a cam mechanism or a pressing unit, but the mechanism for driving the retracting optical system For example, the actuator may be driven by an actuator or the like.
(2) The lens barrel of the embodiment is a lens barrel that performs a collapsible operation. However, the lens barrel is not limited to this. Good. In this case, a support member that supports a lens group adjacent to the retracting optical system (corresponding to the third lens group of the embodiment) and driving the retracting optical system in the direction of the optical axis (corresponding to the protrusion of the embodiment) It is good to provide.
(3) The lens barrel of the embodiment is configured such that the third lens group is slid and retracted. However, the retracting optical system is not limited to this, and for example, the CCD slides in a direction parallel to the imaging surface. A configuration for evacuation may be used.

It is sectional drawing containing the optical axis of the lens-barrel of embodiment. FIG. 2 is a perspective view of a third group support unit and a CCD base provided in the lens barrel of FIG. 1 as viewed from the subject side in the optical axis direction. FIG. 2 is a perspective view of a third group support unit, a fourth group holding frame, and a CCD table provided in the lens barrel of FIG. 1 as viewed from the optical axis direction image side. It is a perspective view which shows the 3rd group support part shown in FIG. It is a disassembled perspective view of the 3rd group support part shown in FIG. It is a figure which shows the positional relationship in the imaging | photography state of the CCD stand and 3 group support part shown in FIG. It is a figure which shows the positional relationship of the CCD base and 3rd group support part after the lens-barrel of the imaging | photography state shown in FIG. 6 transfers to the accommodation state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Lens barrel: 10 CCD: 20 CCD stand: 21 Cam part: 22 Press part: 70 3rd group support part: 71 Base part: 72 3rd lens group holding frame: 72c Contact part: L3 3rd lens group

Claims (8)

A first support for supporting the first optical system;
A holding unit for holding the second optical system;
A second support part that supports the holding part and is movable relative to the first support part in an optical axis direction of the first optical system;
A first moving mechanism for moving the holding portion relative to the second support portion in a plane perpendicular to the optical axis;
An optical apparatus comprising: a second movement mechanism that moves the holding unit in the optical axis direction with respect to the second support unit. The optical instrument according to claim 1,
In the first moving mechanism, a second cam provided in the holding portion is provided with a first cam portion provided in the first support portion in conjunction with an approaching operation of the first support portion and the second support portion. An optical device characterized by being a cam mechanism that engages with a cam portion. The optical apparatus according to claim 1 or 2,
The first moving mechanism includes a first position where the optical path overlaps the optical path of the first optical system, and a second position where the optical path is retracted from the optical path of the first optical system. Move between
The optical apparatus, wherein the second moving mechanism moves the holding unit in the optical axis direction at the second position. In the optical instrument according to any one of claims 1 to 3,
The second moving mechanism is a pressing portion that is provided in the first support portion and presses the holding portion in the optical axis direction in conjunction with an approaching operation between the first support portion and the second support portion. Optical equipment characterized by this. The optical apparatus according to claim 4,
The optical device, wherein the pressing portion is a protrusion that protrudes from the first support portion toward the second support portion. The optical apparatus according to claim 4 or 5,
The first moving mechanism includes a first position where the optical path overlaps the optical path of the first optical system, and a second position where the optical path is retracted from the optical path of the first optical system. Drive between
The optical device, wherein the pressing portion is provided at a position where the holding portion can be pressed when the second optical system is at the second position. The optical apparatus according to claim 6, wherein
An optical apparatus comprising: an urging portion that urges the holding portion toward the first position and urges the holding portion in a direction approaching the second support portion. The optical apparatus according to any one of claims 1 to 7,
The optical apparatus, wherein the first optical system is an image sensor and the second optical system is a lens.

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