JP2006053208A - Single lens reflex camera and optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single lens reflex camera exactly maintaining the relative position of an electronic device to an optical member, and also to provide an optical device. <P>SOLUTION: An FPC for a CCD 150 connected to a CCD unit 140 is extended forward from two right and left spots branched to avoid the ridge line 101c of a pentagonal prism 101 positioned ahead nearly in parallel with the CCD unit 140. Since the FPC for a CCD 150 need not be folded near the CCD unit 140, excess force is not exerted on the CCD unit 140. A left side signal line 151 is bent toward a right side in front of a pentagonal prism 101 near the ridge line 101d on the left side of the pentagonal prism 101. The edge parts of the left side signal line 151 and a right side signal line 152 going toward the right side of a camera body 1 are joined to be one signal line, which is connected to a main FPC 121 through a connector. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a single-lens reflex camera and an optical apparatus in which an electronic device is disposed in the vicinity of an optical member having a ridgeline.

  As an apparatus including an optical member having a ridge line, for example, a single-lens reflex camera including a pentaprism constituting a finder optical system is known. In a single-lens reflex camera, a flexible printed circuit board is disposed so as to straddle the top ridge line of the pentaprism for the purpose of improving assembling performance and reducing the number of assembling steps (see Patent Document 1).

JP-A-8-234289

  A single-lens reflex camera may be provided with a CCD unit that performs photometry using subject light emitted from a pentaprism. This CCD unit is connected to a main flexible printed circuit board arranged so as to straddle the top ridge line of the pentaprism via a flexible printed circuit board directly connected to the CCD unit. In recent years, since many electronic components have been mounted on the portion where the main flexible printed circuit board is located on the slope of the pentaprism, the flexible printed circuit board directly connected to the CCD unit is located above the pentaprism. It is pushed up, and a force to move the CCD unit from the fixed position is applied. For this reason, the relative position of the CCD unit with respect to the pentaprism may be shifted and accurate photometry may not be possible.

(1) A single-lens reflex camera according to the first aspect of the invention constitutes a finder optical system that guides incident subject light to an eyepiece, and is provided in the vicinity of an optical member having a ridge line at the top and an extension line of the ridge line. An electronic device that uses a part of the subject light guided to the optical member, an adjustment unit that adjusts an installation position of the electronic device relative to the optical member, and a circuit board that transmits the electrical signal by connecting the electronic device to another electronic device. And at least a portion disposed in the vicinity of the ridge line of the circuit board is branched into two so as to prevent interference with the ridge line.
(2) A single-lens reflex camera according to the invention of claim 2 constitutes a finder optical system that guides incident subject light to an eyepiece, and is provided in the vicinity of an optical member having a ridge line at the top and an extension line of the ridge line. An electronic device that uses a part of the subject light guided to the optical member, an adjustment unit that adjusts an installation position of the electronic device relative to the optical member, and a circuit board that transmits the electrical signal by connecting the electronic device to another electronic device. And at least a portion disposed in the vicinity of the ridge line of the circuit board is branched into two so as to prevent interference with an end portion of the ridge line adjacent to the electronic device.
(3) According to the invention of claim 3, in the single-lens reflex camera according to claim 1 or 2, the circuit board is reassembled with a portion that is arranged near the ridge line of the circuit board and branches into two. Thus, an opening for preventing interference with at least the edge of the ridge line close to the electronic device is formed.
(4) The invention of claim 4 is the single-lens reflex camera according to any one of claims 1 to 3, wherein the electronic device is a CCD element for photometry.
(5) According to a fifth aspect of the present invention, in the single-lens reflex camera according to any one of the first to fourth aspects, the circuit board is a flexible printed board.
(6) An optical device according to a sixth aspect of the invention includes an optical member having a ridge line that emits incident light so that the optical axis is different from the optical axis of the incident light, and one of the emitted light emitted from the optical member. An electronic device that uses the unit, an adjustment unit that adjusts an installation position of the electronic device with respect to the optical member, and a circuit board that transmits the electrical signal by connecting the electronic device to another electronic device, and at least a ridge line of the circuit board The portion disposed in the vicinity is characterized in that it is branched into two so as to prevent interference with the edge of the ridge line adjacent to the electronic device.

  According to the present invention, the portion where the circuit board is disposed in the vicinity of the ridge line is branched into two so as to prevent interference with the optical member. Therefore, even if the electronic device is disposed in the vicinity of the optical member, it is not necessary to bend the circuit board in the vicinity of the electronic device. Therefore, the circuit board is disposed while preventing the generation of a force that moves the electronic device from the fixed position. Can be set. Thereby, the relative position of the electronic device with respect to the optical member can be accurately maintained.

--- First embodiment ---
A first embodiment of an optical device according to the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a single lens reflex type camera (camera body) 1 according to the present invention and a photographing lens 2 attached to the camera body 1. A release button 4 is provided at the top of the camera body 1, and an accessory shoe 5 is provided behind the viewfinder 3. In this embodiment, a camera using a silver salt film is described as an example. However, the present invention is not limited to a silver salt camera, and may be an electronic camera using a solid-state imaging device such as a CCD. In the following description, the front, rear, left, right, and up and down directions of the camera are defined as shown in each drawing.

  2 is a perspective view of the camera body 1 as seen from an oblique rear side in a state where the camera body 1 is disassembled into main components, and FIG. 3 is an enlarged view of the vicinity of the upper portion of the front body 100 in FIG. The camera body 1 includes a front body 100, a rear body 200, and an upper cover 300. The front body 100 mainly includes a front plate 104, an L substrate 107, and an I substrate 108.

  A prism box 103 on which a pentaprism 101 that is a finder optical system unit and an eyepiece block 102 are mounted is attached to the front plate 104. The left roof surface is referred to as the left roof surface 101a and the right roof surface is referred to as the right roof surface 101b with the ridge line 101c at the top of the pentaprism 101 as a boundary. A CCD unit 140 is fixed to the upper part of the eyepiece block 102. The CCD unit 140 will be described in detail later.

  In the space formed by the L substrate 107 and the I substrate 108, there are a main mirror 109 that can be rotated during exposure, and a sub mirror 110 that guides the light branched by the main mirror 109 to the automatic focus detection module 111. Is provided. The automatic focus detection module 111 is fixed to the lower part of the L substrate 107 with a screw (not shown).

  A main flexible printed circuit board (hereinafter referred to as main FPC) 121 is disposed from the right side to the left roof surface 101a across the ridge line 101c of the pentaprism 101 from the right side. The main FPC 121 is mounted with a CPU 123 for processing various signals, a liquid crystal display unit 124, a liquid crystal driver 125, and other components (not shown). A pressure contact portion 126 at the right front end of the main FPC 121 is fixed to a pressure contact portion (not shown) of a flexible printed board mounted on the rear body 200. A connector terminal 122a is provided at the left end of the main FPC 121 and is connected to a connector terminal 122b provided on a sub-flexible printed circuit board 113 to be described later. The connector 122 is configured by the connector terminals 122a and 122b.

  A sub flexible printed circuit board (hereinafter referred to as sub FPC) 113 is disposed from the lower part of the front body 100 to the left roof surface 101a of the pentaprism 101 via the left side surface. A connector terminal 122b is provided at the upper end of the sub FPC 113. As described above, the sub FPC 113 is electrically and mechanically connected to the main FPC 121 by connecting the connector terminal 122b to the connector terminal 122a of the main FPC 121. The sub FPC 113 is connected to a flexible printed circuit board (hereinafter referred to as FPC) 112 by a connector 114 provided at the lower end of the sub FPC 113, and is connected to the automatic focus detection module 111 through the FPC 112.

  FIG. 4 is a cross-sectional view of the camera body 1 viewed from the left side of the camera in a state where the rear body 200 and the front body 100 are coupled. In the prism box 103, a focusing screen 132 on which an image from the main mirror 109 is formed and a field frame 131 for determining the size of the viewfinder field are mounted together with the pentaprism 101 and the eyepiece block 102. The field frame 131 is fixed between the lower part of the pentaprism 101 and the prism box 103. The focusing screen 132 is fixed to the lower surface of the prism box 103 by a screen pressing frame 133. The upper surface of the focusing screen 132 is a focal plane 132a, on which an image reflected by the main mirror 109 is formed.

  As shown in FIGS. 2 and 4, the rear body 200 is provided with an aperture member 236 that determines a screen size to be exposed. The aperture member 236 is provided with an aperture opening 236a, and a photographing film 235 is disposed immediately after the aperture opening 236a.

--- About CCD unit 140 ---
The CCD unit 140 is provided with a CCD 141 for receiving subject light on the lower surface, and a flexible printed circuit board (hereinafter referred to as CCD FPC) 150 for transmitting an electrical signal from the CCD unit 140 is connected to the upper surface. The subject light imaged on the focal plane 132a of the focusing screen 132 passes through the pentaprism 101 and the prism 161 and the lens 162 arranged behind the pentaprism 101 as shown in the optical axis 160 shown in FIG. Then, the light is guided to the CCD 141. As a result, the subject light is measured by the CCD unit 140.

  In order to perform photometry with high accuracy, it is necessary to accurately dispose the CCD 141 with respect to the pentaprism 101. That is, the relative position of the CCD unit 140 with respect to the pentaprism 101 must be accurate, and the error is desirably within 10 to 20 μm. Therefore, in order to attach the CCD unit 140 while adjusting the relative position of the CCD prism 140 to the pentaprism 101, the CCD unit 140 is attached to the upper part of the eyepiece block 102 as follows.

  As shown in FIG. 4, a mounting hole 102 a is provided in the upper part of the eyepiece block 102. The attachment holes 102a are provided in four places, two on the left and right sides, respectively, and as shown in FIGS. 2 and 3, the CCD unit 140 is attached to the spring 106 by a screw 105 screwed into the attachment hole 102a. And is attached to the eyepiece block 102. That is, the CCD unit 140 is pressed upward by the spring 106 and the upward movement is restricted by the screw 105. Thus, by adjusting the screw 105, the relative position of the CCD unit 140 with respect to the pentaprism 101 can be accurately set. After the relative position of the CCD unit 140 with respect to the pentaprism 101 is accurately set, the screw 105 is fixed to the CCD unit 140 with an adhesive or the like.

--- About FPC150 for CCD ----
Since the CPU 123 mounted on the main FPC 121 performs photometric control based on the electrical signal output from the CCD unit 140, it is necessary to connect the CCD FPC 150 connected to the CCD unit 140 to the main FPC 121. Further, since it is necessary to measure the subject light emitted from the rear of the pentaprism 101 with the CCD 141, the CCD unit 140 needs to be disposed in the vicinity of the eyepiece block. For this reason, in the conventional single-lens reflex camera, the conventional CCD FPC is bent upward in the vicinity of the CCD unit 140 so as to cover the ridge line 101 a of the pentaprism 101.

  However, in recent years, since many electronic components have been mounted on portions where the main FPC 121 and the sub FPC 113 are disposed along the left and right roof surfaces 101a and 101b, a conventional FPC for CCD is used. Must be bent in the vicinity of the CCD unit 140 at a steeper angle than ever before. Therefore, an extra force is applied to the CCD unit 140 such as a repulsive force against the bending of the CCD FPC is also transmitted to the CCD unit 140 or the CCD unit 140 is pushed and pulled due to a displacement of the arrangement position of the CCD FPC. . As described above, the relative position of the CCD unit 140 with respect to the pentaprism 101 must be accurate, but there is a possibility that the relative position may be shifted due to the above-described extra force applied from the conventional CCD FPC.

  Therefore, in the present embodiment, as shown in FIGS. 2 to 4, the CCD FPC 150 connected to the CCD unit 140 is moved forward from two left and right branches branched so as to avoid the ridgeline 101 c of the pentaprism 101 located in front. Toward the CCD unit 140. As a result, it is not necessary to bend the CCD FPC 150 in the vicinity of the CCD unit 140, so that the above-described extra force is not applied to the CCD unit 140. In the CCD FPC 150, a portion extending forward on the left roof surface 101a is called a left signal line 151, and a portion extending forward on the right roof surface 101b is a right signal line 152. Call.

  5 is a cross-sectional view taken along the line VV in FIG. In FIG. 5, the eyepiece block 102 and the CCD unit 140 are indicated by a two-dot chain line for easy understanding. The left signal line 151 and the right signal line 152 of the CCD FPC 150 are separated from the main FPC 121 and the sub FPC 113 arranged along the left and right roof surfaces 101a and 101b, respectively, and are located inside the finder portion 3 of the upper cover 300. It extends forward through the space.

  As shown in FIGS. 2 to 4, the left signal line 151 is bent toward the right side of the front surface of the pentaprism 101 in the vicinity of the left ridge line 101 d of the pentaprism 101. The right signal line 152 is bent toward the right along the right roof surface 101b before the right ridge line 101e of the pentaprism 101. The front end portions of the left signal line 151 and the right signal line 152 toward the right side of the camera body 1 merge to form one signal line and are connected to the main FPC 121 via a connector (not shown). That is, the left signal line 151 and the right signal line 152 form an opening so as to bypass the ridge line 101c of the pentaprism 101. Since the amount of information transmitted from the CCD unit 140 to the main FPC 121 is large, both the left and right signal lines 151 and 152 are required in this embodiment.

The first embodiment described above has the following operational effects.
(1) The portion where the CCD FPC 150 is disposed in the vicinity of the ridge line 101c is branched into two so that the CCD FPC 150 and the ridge line 101c of the pentaprism 101 do not interfere with each other. Therefore, even if the CCD unit 140 is disposed in the vicinity of the rear side of the pentaprism 101, it is not necessary to bend the CCD FPC 150 in the vicinity of the CCD unit 140, so that generation of force that moves the CCD unit 140 from a fixed position is prevented. Thus, the CCD FPC 150 can be provided. Thereby, since the relative position of the CCD unit 140 with respect to the pentaprism 101 can be accurately maintained, deterioration of photometric accuracy by the CCD unit 140 can be prevented. In addition, since the CCD unit 140 can be disposed close to the pentaprism 101, the camera body 1 can be made compact.

(2) The left signal line 151 and the right signal line 152 of the CCD FPC 150 are separated from the main FPC 121 and the sub FPC 113 arranged along the left and right roof surfaces 101a and 101b, respectively, and are located inside the viewfinder section 3. The space was configured to extend forward. This prevents interference with the electronic components mounted on the main FPC 121 and the sub FPC 113 arranged along the left and right roof surfaces 101a and 101b, and the left signal line without increasing the height of the camera body 1. 151 and the right signal line 152 can be disposed, so that the design change of the finder section 3 and the FPCs 121 and 113 of the upper cover 300 is unnecessary, and the cost is low.

(3) Since there is no need to bend the CCD FPC 150 in the vicinity of the CCD unit 140, there is almost no repulsive force against the bending of the CCD FPC 150. Therefore, no extra external force is applied to the CCD unit 140 when the CCD unit 140 is attached to the eyepiece block 102 while adjusting the relative position of the CCD unit 140 to the pentaprism 101 with the screw 105. This facilitates the mounting and adjustment work of the CD unit 140, so that the mounting accuracy to the eyepiece block 102 can be improved and the adjustment time can be shortened, so that the photometric accuracy can be improved and the assembly cost can be reduced.

  With the above-described configuration, the CCD unit 140 accurately maintains not only the relative position with respect to the pentaprism 101 but also the relative position with respect to each part of the camera body 1.

--- Second Embodiment ---
A second embodiment of the optical device according to the present invention will be described with reference to FIG. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and different points will be mainly described. The configuration of the camera body 1 of the second embodiment is the same as that of the first embodiment except for a flexible printed circuit board (hereinafter referred to as CCD FPC) 250 connected to the CCD unit 140.

  FIG. 6 is an enlarged view of the vicinity of the upper portion of the front body 100 when the inside of the camera body 1 according to the second embodiment is viewed obliquely from the left rear. The CCD FPC 250 connected to the CCD unit 140 includes a front peripheral end 251 disposed in the vicinity of the rear end face of the pentaprism 101, a left signal line 252, a right signal line 253, and a front signal line 254. .

  The left signal line 252 and the right signal line 253 are branched from the front peripheral end 251 so as to avoid the rear end 101f of the ridge line 101c of the pentaprism 101 located in the front, and forward from two left and right positions toward the front. It extends substantially parallel to 140. The left end of the front signal line 254 is connected to the front end of the left signal line 252 and extends in the left-right direction across the ridge line 101c. The right end of the front signal line 254 merges with the right signal line 253 on the upper surface of the right roof surface 101b to form one signal line, and is connected to the main FPC 121 via a connector (not shown).

  That is, the CCD FPC 250 is formed so as to avoid the rear end 101f of the ridge line 101c of the pentaprism 101 by the front peripheral end 251, the left signal line 252, the right signal line 253, and the front signal line 254. Opening 255 is provided. When the CCD FPC 250 is disposed above the pentaprism 101, the vicinity of the approximate center of the front signal line 254 is bent along the left and right roof surfaces 101a and 101b. When the CCD FPC 250 is disposed above the pentaprism 101, the rear end portion 101 f of the ridge line 101 c of the pentaprism 101 is in a state of protruding from the opening 255.

  By using the CCD FPC 250 configured as described above, it is not necessary to bend the CCD FPC 250 in the vicinity of the CCD unit 140 in the same manner as the CCD FPC 150 of the first embodiment. Power is not added. And there exists an effect similar to the effect of 1st Embodiment.

Further, in the second embodiment, the following operational effects are obtained in addition to the operational effects of the first embodiment.
(1) The CCD FPC 250 is configured to include a left signal line 252 and a right signal line 253 that extend substantially parallel to the CCD unit 140, and a front signal line 254 that extends in the left-right direction across the ridge line 101c. ing. As a result, the entire length of the CCD FPC 250 can be shortened while preventing generation of a force that moves the CCD unit 140 from the fixed position, thereby improving assemblability.

---- Modified example ---
(1) In the above description, the camera body 1 having the pentaprism 101 has been described, but the present invention is not limited to this. For example, a so-called mirror pentaprism may be used instead of the pentaprism 101.

(2) In the above description, the electronic device disposed near the rear of the pentaprism 101 is the CCD unit 140, but the present invention is not limited to this. In addition to the CCD, an electronic device that converts light into an electrical signal, such as a CMOS sensor, may be used. In addition, the electronic device may not use light emitted from the pentaprism. For example, if the electronic device needs to be installed in the vicinity of the pentaprism and a signal line such as a flexible printed circuit board connected to the electronic device needs to be arranged in the vicinity of the pentaprism, the present invention As described above, the installation position of the electronic device relative to the object to be installed can be accurately maintained as described above.

(3) In the above description, a single lens reflex camera has been described as an example of the optical device according to the present invention, but the present invention is not limited to this. For example, an optical device including an optical member that emits incident light having a ridgeline and an optical axis different from the optical axis of incident light, such as binoculars and field scopes having prisms, The present invention can be applied when a device needs to be disposed.
(4) You may combine each embodiment and modification which were mentioned above, respectively.

  In the above embodiment and its modifications, for example, the optical member corresponds to the pentaprism 101, the electronic device corresponds to the CCD unit 140, and the circuit board corresponds to the flexible printed circuit board (FPC for CCD) 150 and 250, respectively. The adjusting means is realized by a screw 105 and a spring 106. Furthermore, as long as the characteristic functions of the present invention are not impaired, the present invention is not limited to the device configuration in the above-described embodiment.

1 is a perspective view showing a single lens reflex type camera (camera body) 1 according to the present invention and a photographing lens 2 attached to the camera body 1; FIG. FIG. 2 is a perspective view of the camera body 1 viewed from an oblique rear side in a state where the camera body 1 is disassembled into main components. FIG. 3 is an enlarged view of the vicinity of the upper portion of the front body 100 in FIG. 2. FIG. 3 is a cross-sectional view of the camera body 1 viewed from the left side of the camera in a state where the rear body 200 and the front body 100 are coupled. It is VV sectional drawing of FIG. It is an enlarged view of the upper part vicinity of the front body 100 when the inside of the camera body 1 of 2nd Embodiment is seen from diagonally left back.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera (camera body) 2 Shooting lens 3 Finder part 100 Front body 101 Penta prism 101a Left roof surface 101b Right roof surface 101c Edge 101f Back end part 102 Eyepiece block 105 Screw 106 Spring 113 Sub flexible printed circuit board (sub FPC)
121 Main flexible printed circuit board (Main FPC)
140 CCD unit 141 CCD
150,250 Flexible printed circuit board (FPC for CCD)
151,252 Left signal line 152,253 Right signal line 200 Rear body 251 Front peripheral edge 254 Front signal line 255 Opening 300 Upper cover

Claims (6)

Constructing a finder optical system that guides incident subject light to the eyepiece, and an optical member having a ridge line at the top,
An electronic device that is provided in the vicinity of an extension line of the ridge line and uses a part of subject light guided to the eyepiece;
Adjusting means for adjusting an installation position of the electronic device with respect to the optical member;
A circuit board for transmitting an electrical signal by connecting the electronic device to another electronic device;
The single-lens reflex camera according to claim 1, wherein at least a portion of the circuit board disposed in the vicinity of the ridge line branches into two so as to prevent interference with the ridge line. Constructing a finder optical system that guides incident subject light to the eyepiece, and an optical member having a ridge line at the top,
An electronic device that is provided in the vicinity of an extension line of the ridge line and uses a part of subject light guided to the eyepiece;
Adjusting means for adjusting an installation position of the electronic device with respect to the optical member;
A circuit board for transmitting an electrical signal by connecting the electronic device to another electronic device;
A single-lens reflex camera characterized in that at least a portion of the circuit board disposed in the vicinity of the ridge line branches into two so as to prevent interference with an end of the ridge line adjacent to the electronic device. . In the single-lens reflex camera of Claim 1 or Claim 2,
The circuit board has an opening for preventing interference with at least an end portion of the ridge line that is disposed in the vicinity of the ridge line of the circuit board and that is divided into two parts and gathers again. A single-lens reflex camera characterized by being formed. In the single-lens reflex camera as described in any one of Claims 1-3,
A single-lens reflex camera, wherein the electronic device is a CCD element for photometry. In the single-lens reflex camera as described in any one of Claims 1-4,
A single-lens reflex camera, wherein the circuit board is a flexible printed board. An optical member having a ridge line that emits the incident light so as to have an optical axis different from the optical axis of the incident light;
An electronic device that uses a portion of the light emitted from the optical member;
Adjusting means for adjusting an installation position of the electronic device with respect to the optical member;
A circuit board for transmitting an electrical signal by connecting the electronic device to another electronic device;
At least a portion of the circuit board disposed in the vicinity of the ridge line is branched into two so as to prevent interference with an end portion of the ridge line adjacent to the electronic device.

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