JP2012037543A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further thin an imaging apparatus that has an optical system for bending the optical path of incident light.SOLUTION: The imaging apparatus includes: an imaging element; a lens barrel unit for bending a luminous flux and causing the imaging element to form an optical image; a display unit for displaying a subject image output from the imaging element; and a chassis member holding the display unit. In the imaging apparatus, an opening from which a movable lens-holding member is exposed is formed in the lens barrel unit. The chassis member is fixed to the lens barrel unit, thereby covering the opening, and a sliding portion, which slides against the lens-holding member when the lens-holding member is moved, is formed in an area covering the opening of the chassis member. Areas other than the sliding portion in the area covering the opening of the chassis member are subjected to an antireflection process and the sliding portion is not subjected to the antireflection process.

Description

  The present invention relates to an image pickup apparatus such as a digital camera, and more particularly to an image pickup apparatus including an optical system that bends an optical path of incident light.

  In recent years, an imaging apparatus such as a digital camera is required to be compact while being required to have high magnification optical performance. Among these, it is known that by using an optical system that bends the optical path of incident light, high magnification optical performance can be obtained without increasing the size of the imaging device. (See Patent Document 1)

JP 2007-108337 A

  However, since the imaging device disclosed in Patent Document 1 has a structure in which the lens device fixed to the main frame is covered with the front case and the rear case, it is difficult to further reduce the thickness of the imaging device.

  An object of the present invention is to further reduce the thickness of an imaging apparatus provided with an optical system that bends the optical path of incident light.

  An image pickup apparatus according to the present invention includes an image pickup element, a lens barrel unit that bends a light beam to form an optical image on the image pickup element, a display unit that displays a subject image output from the image pickup element, and the display unit. An imaging apparatus having a holding chassis member, wherein the lens barrel unit has an opening through which a moving lens holding member is exposed, and the chassis member is fixed to the lens barrel unit to cover the opening. In addition, a sliding portion that slides with the lens holding member when the lens holding member moves is formed in a region that covers the opening of the chassis member, and of the region that covers the opening of the chassis member, An area other than the sliding portion is subjected to an antireflection treatment, and the sliding portion is not subjected to an antireflection treatment.

  According to the present invention, the chassis member can function as a part of the lens barrel unit, and the imaging device can be thinned at least for one wall of the lens barrel unit as compared with the conventional imaging device. .

The perspective view in the state where the exterior member of the imaging device concerning this embodiment was removed. The perspective view in the state where the exterior member of the imaging device concerning this embodiment was removed. The expansion | deployment perspective view which shows the structure of a 2nd lens holding member. Sectional drawing which shows the state of a lens-barrel unit when an imaging device will be in a retracted state. Sectional drawing which shows the state of a lens-barrel unit when an imaging device will be in the imaging state in a wide angle end. Sectional drawing which shows the state of a lens-barrel unit when an imaging device will be in the imaging state in a telephoto end. The figure which looked at the lens-barrel unit when an imaging device will be in a retracted state from the back side. The figure which looked at the lens-barrel unit from the back side when an imaging device will be in the imaging state in a wide angle end. The figure which looked at the lens-barrel unit from the back side when an imaging device will be in the imaging state in a telephoto end. The exploded development figure which shows the arrangement | positioning relationship between a lens-barrel unit, a chassis member, and a display unit. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 of the imaging apparatus. The perspective view explaining the shape of a chassis member.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are perspective views showing a state in which an exterior member of the imaging apparatus according to the embodiment of the present invention is removed.

  As shown in FIG. 1, the imaging apparatus 1 includes a lens barrel unit 12. The lens barrel unit 12 includes a first lens barrel portion 21 that moves the lens in the direction of the optical axis AX1, and a second lens barrel portion 31 that moves the lens in the direction of the optical axis AX2.

  As shown in FIG. 2, a display unit 10 that displays a subject image output from the imaging device 4 is provided on the back side of the imaging device 1.

  The configuration of the second lens barrel portion 31 included in the lens barrel unit 12 will be described with reference to FIG. The second lens barrel portion 31 includes the reflective optical member 11 that reflects the light beam emitted from the first lens barrel portion 21 and makes it incident on the second lens barrel portion 31. Therefore, the reflective optical member 11 bends the photographing optical axis from the AX1 direction to the AX2 direction. In the lens barrel unit 12, two guide shafts 13a and 13b are provided so as to be parallel to the optical axis AX2, and guide the movement of the reflective optical member 11 in the optical axis AX2 direction.

  The reflective optical member 11 is provided with a rack (not shown) and moves straight in the direction of the optical axis AX2 by converting the rotation of the motor 310 into a linear motion.

  The second lens barrel 31 includes a lens frame 311, a lens frame 314, and a lens frame 316 as lens holding members. The two guide shafts 13a, 13b guide the movement of the lens frames 311, 314, 316 in the direction of the optical axis AX2.

  The lens frame 311 includes a light amount adjusting unit and a shake correcting unit. The drive of the motor 312 is transmitted to the lens frame 311 via the lead screw 313, and the lens frame 311 is guided by the two guide shafts 13a and 13b and moves in the direction of the optical axis AX2.

  The lens frame 314 is always urged in the direction of the lens frame 311 by the tension coil spring 315, and is guided by the two guide shafts 13a and 13b to follow the linear movement of the lens frame 311.

  The driving of the motor 317 is transmitted to the lens frame 316 via the lead screw 318 and is guided by the two guide shafts 13a and 13b, so that the lens frame 316 moves in the direction of the optical axis AX2.

  The imaging device 4 is fixed to the lens barrel unit 12, and a light beam emitted from a lens held by the lens frame 316 forms an image on the light receiving surface of the imaging device 4. The image sensor 4 is an image sensor such as a CCD or CMOS, and generates and outputs an electrical signal based on an optical image formed on the light receiving surface.

  4 to 6 are BB cross-sectional views of FIG. 1 when the imaging apparatus 1 is in the retracted state, the photographing state at the wide-angle end, and the photographing state at the telephoto end.

  4 is a cross-sectional view taken along the line BB in FIG. 1 when the imaging apparatus 1 is in the retracted state. FIG. 5 is a cross-sectional view taken along the line BB in FIG. 1 when the imaging apparatus 1 is in a shooting state at the wide-angle end. 6 is a cross-sectional view taken along line BB in FIG. 1 when the imaging apparatus 1 is in a shooting state at the telephoto end.

  After the imaging apparatus is turned on, when the retracted state shown in FIG. 4 shifts to the photographing state shown in FIGS. 5 and 6, the first lens barrel portion 21 is extended along the optical axis AX1. Then, when the first lens barrel portion 21 is extended to the subject side, a space is generated between the first lens barrel portion 21 and the chassis member 9. In this space, the reflection optical system 11 for folding the light beam incident on the lens barrel unit 12 along the optical axis AX1 in the direction of the optical axis AX2 moves to the back surface of the first lens barrel portion 21 along the direction of the optical axis AX2. . Thereafter, the second lens barrel 31 moves along the second optical axis AX2 to shift to the photographing state.

  7 to 9 are views of the lens barrel unit 12 as seen from the back when the imaging apparatus 1 is in the retracted state, the photographing state at the wide-angle end, and the photographing state at the telephoto end.

  FIG. 7 is a view of the lens barrel unit 12 as viewed from the back when the imaging apparatus 1 is in the retracted state. The state shown in FIG. 7 and the state shown in FIG. 4 are the same state.

  FIG. 8 is a view of the lens barrel unit 12 as seen from the back when the imaging apparatus 1 is in a shooting state at the wide-angle end. The state shown in FIG. 84 and the state shown in FIG. 5 are the same state.

  FIG. 9 is a view of the lens barrel unit 12 as viewed from the back when the image pickup apparatus 1 is in a shooting state at the telephoto end. The state shown in FIG. 9 and the state shown in FIG. 6 are the same state.

  As shown in FIGS. 7 to 9, an opening 12 a is formed on the back side of the lens barrel unit 12, and the reflective optical member 11 and the lens frames 311, 314, and 316 moving from the opening 12 a are exposed.

  The lens frame 311 is provided with a sliding pin 32, and the sliding pin 32 is urged in the back direction by a compression coil spring 33. The operation of the sliding pin 32 will be described later.

  FIG. 10 is a perspective view showing a state in which the rear side of the lens barrel unit 12 is fixed to the chassis member 9 and the display unit 10 is held by the chassis member 9. By fixing the lens barrel unit 12 to the chassis member 9, the opening 12a of the lens barrel unit 12 is covered by the chassis member 9, and the interior of the lens barrel unit 12 is a light-shielded space. Further, since the region covering the opening 12a of the chassis member 9 is subjected to an antireflection treatment such as black coating, the region covering the opening 12a of the chassis member 9 functions as a wall of the barrel unit 12.

  11 is a cross-sectional view taken along line AA in FIG. By fixing the back side of the lens barrel unit 12 to the chassis member 9, the sliding pin 32 provided on the lens frame 311 is urged to the chassis member 9 by the compression coil spring 33. FIG. 11 shows a state in which the sliding pin 32 is biased by the chassis member 9. The sliding pin 32 biases the chassis member 9 so that the clearance between the lens frame 311 and the guide shafts 13a and 13b can be shifted. As a result, the positional accuracy of the lens frame 311 can be improved, and deterioration of the captured image quality can be prevented. Further, the sliding pin 32 urges the chassis member 9 to prevent the second lens holding member 31 from being tilted by the fitting clearance with the guide shafts 13a and 13b. Thereby, the driving load of the lens frame 311 can be made constant.

  Since the lens frame 311 moves in the optical axis AX2 direction, the sliding pin 32 slides on the surface of the chassis member 9 as the lens frame 311 moves. For this reason, the chassis member 9 is formed with a sliding portion 91 serving as a region where the sliding pin 32 slides. In the present embodiment, the chassis member 9 is formed of a thin metal material, and the sliding portion 91 that satisfies the dimensional accuracy is formed by half punching or drawing on the thin metal material. As shown in FIG. 11, the sliding portion 91 is formed so as to protrude from the holding surface of the display unit 10 toward the lens barrel unit 12.

  As described above, the region covering the opening 12a of the chassis member 9 is subjected to an antireflection treatment such as black coating, but the sliding portion 91 and the sliding pin 32 are always in sliding contact with each other. May occur. If the peeled paint piece enters the mechanical part of the lens barrel unit 12, there is a possibility that a malfunction of the operation may occur. Similarly, if the coating piece adheres to the surface of the lens or the light receiving surface of the image sensor 4, the image quality of the image is deteriorated. In this embodiment, after the masking process is performed on the sliding portion 91, the chassis member 9 performs black coating for preventing reflection in order to prevent such a problem due to peeling of the coating. Therefore, an antireflection treatment such as black coating is performed on the region other than the sliding portion in the region covering the opening of the chassis member, and an antireflection processing such as black coating is not performed on the sliding portion.

  On the other hand, since the sliding portion 91 of the chassis member 9 is not subjected to antireflection treatment such as black coating, there is a possibility that light reflection may occur at the sliding portion 91. In order to prevent this, the sliding portion 91 is formed in a portion away from the photographing optical path. Furthermore, as shown in FIGS. 10 to 12, by providing a light shielding wall 92 around the sliding portion 91 provided on the chassis member 9, the lens barrel can be used even when the antireflection coating is not applied to the sliding portion 91. Light reflection inside the unit 12 can be prevented. Furthermore, by providing the light shielding wall 92 so as to project in the direction of the optical axis AX2, the strength of the sliding portion 91 can be improved.

  As described above, according to the imaging apparatus according to the present embodiment, by causing a part of the chassis member 9 to function as the wall of the barrel unit 12, the dimension in the thickness direction of the imaging apparatus is reduced, that is, the imaging apparatus is thin. It becomes possible to become. Also, even when the chassis member 9 functions as the wall of the lens barrel unit 12, the anti-reflection treatment is not performed on the portion where the lens frame slides to prevent foreign matter from being generated in the lens barrel. can do. Furthermore, by forming the wall portion around the sliding portion, it is possible to obtain the effects of preventing reflection at the sliding portion and improving the strength.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

4 Image sensor 9 Chassis member 10 Display unit 11 Reflective optical member 12 Lens barrel unit 13a, 13b Guide shaft 21 First lens barrel portion 31 Second lens barrel portion 32 Slide pin 91 Slide portion 92 Light shielding wall 311 314 316 Lens holding frame

Claims (3)

An image sensor;
A lens barrel unit that folds a light beam to form an optical image on the image sensor;
A display unit for displaying a subject image output from the imaging device;
An imaging device having a chassis member that holds the display unit,
The lens barrel unit is formed with an opening through which the moving lens holding member is exposed,
The chassis member is fixed to the lens barrel unit, thereby covering the opening and sliding with the lens holding member when the lens holding member moves in a region covering the opening of the chassis member. A sliding part is formed,
An image pickup apparatus characterized in that an antireflection process is performed on an area other than the sliding part in an area covering the opening of the chassis member, and an antireflection process is not performed on the sliding part.   The imaging apparatus according to claim 1, wherein the sliding portion is formed to project from the holding surface of the display unit toward the lens barrel unit.   The imaging apparatus according to claim 1, wherein a light shielding wall protruding from the sliding portion is formed around the sliding portion.