JP2723512B2 - Bottom structure of SLR camera - Google Patents

Description

The present invention relates to a bottom structure of a single-lens reflex camera that electronically controls various functions. B. Prior Art In this type of conventional single-lens reflex camera, as shown in FIGS. 3 and 4, a flexible circuit board 1 on which an electronic control IC 1a and the like are mounted is mounted on an upper part of a pentaprism 2 and on the left and right sides thereof. Is arranged inside the upper cover 3. In FIGS. 3 and 4, reference numeral 4 denotes a mount fixed to the camera body, 5 denotes a mount mounting portion projecting from the camera body around the mount 4, and 6 denotes a mount mounting portion 5.
The bottom of the camera with the front receding to the back of the camera from the
Is a bottom cover for covering the camera bottom 6, reference numeral 8 is a quick return mirror, reference numeral 9 is a film surface, reference numeral 10 is a release button, reference numeral 11 is a shutter dial, reference numeral 12 is an ISO dial, and reference numeral 13 is provided on the camera upper cover 3 for mounting an electronic flash device. The mounting base. C. Problems to be Solved by the Invention Such conventional single-lens reflex cameras have the following problems. Since the electronic flash device (not shown) is mounted on the mounting table 13 provided on the upper part of the pentarhythm 2, noise due to charging and light emission may affect a CPU or the like in the IC 1a and cause a malfunction. Electrical elements must be well shielded. For this reason, a shield material is required, which leads to an increase in the number of parts and an increase in the number of assembly steps. If it is necessary to check the electronic control circuit in the inspection process after assembly is completed, the release button 10, shutter dial 11, and ISO dial 12 attached to the upper cover 3 must be removed before removing the upper cover 3. Without
Poor workability. Also, it was not possible to check while changing the shutter speed or ISO value. Flexible circuit board 1 above pentaprism 2
, The finder cannot be replaced. In the case of a viewfinder replaceable camera, the flexible circuit board 1 and the like are dispersedly arranged in other spaces, leaving a space above the finder prism 2, which is a problem from the viewpoint of the number of parts and assembly workability. Was. SUMMARY OF THE INVENTION An object of the present invention is to provide a bottom structure of a single-lens reflex camera in which a mounting space for an electric element such as a flexible circuit board is secured at the bottom of the camera to solve the above-mentioned problems. D. Means for Solving the Problems The present invention will be described with reference to FIGS. 1 and 2 showing an embodiment. The present invention is applied to a single-lens reflex camera provided with a mounting portion 55 protruding. A space 52 for accommodating the electric component 51 (51a) is formed in the camera bottom 56,
The space 52 has a mount mounting portion 55 in the front-rear direction of the camera.
To the rear of the camera, the front of the camera bottom 56 is at least substantially flush with the mounting portion 55, and the rear of the bottom 56 is at least substantially flush with the back of the camera, and the front and rear of the camera bottom 56 are The above-mentioned object is achieved by forming the gap so as to maintain at least the same gap as the gap between the mounting portion 55 and the back of the camera. The invention described in claim 2 is the bottom structure of the single-lens reflex camera according to claim 1,
A bottom cover 57 that covers the space 52 is detachably provided on the camera bottom 56. E. Function In the invention described in claim 1, the camera bottom
A space 52 for accommodating the electric component 51 (51a) is formed in 56, and the space 52 extends from the mount mounting portion 55 to the back of the camera in the front-rear direction of the camera.
Larger electrical components than before can be stored in 56 spaces 52. Also, since electrical parts are stored in the camera bottom 56,
Even if the electronic flash device is attached to the camera cover,
There is no possibility that the noise caused by the charging or the flash will affect the electrical components. Further, since the bottom area of the camera bottom 56 increases in front of the camera, the stability of the camera is improved. F. Embodiment An embodiment of the present invention will be described with reference to FIGS. The same parts as in FIGS. 3 and 4 are denoted by the same reference numerals. The mount mounting portion 55 projects from the camera body not only around the mount 4 but also over the entire width of the lower portion of the front surface of the camera. Correspondingly, the camera bottom portion 56 is formed such that the front surface is substantially flush with the front surface 55a of the mount mounting portion 55, and the rear surface is substantially flush with the camera rear surface. Therefore, as shown in FIG. 2, the width Wn of the camera bottom 56 in the front-rear direction of the camera is wider than the width Wo of the conventional camera bottom shown in FIG. The camera bottom 56 has electrical elements for electronic control of the camera, etc.
A space 52 for accommodating the flexible circuit board 51 on which 1a and the like are mounted is secured.
The flexible circuit board 51 on which the IC 51a is mounted is housed,
Screwed to the camera body. This storage space 52
Is covered with a bottom lid 57 screwed to the camera body.
When mounting the flexible circuit board 51,
In a state in which is installed, the check land for circuit check provided on the substrate 51 is directed to the lower surface of the camera. When the bottom cover 57 is removed, the prober or the like can easily contact the check land. Note that a rigid circuit board may be used instead of the flexible circuit board. Further, a substrate on which an IC or the like is mounted on both sides may be used. With such a configuration, the width of the bottom of the camera in the front-rear direction of the camera is widened, and the wide circuit board 51 on which the large-sized IC 1a having a large number of pins is mounted can be accommodated. In addition, since a large plane space is secured, a rigid circuit board can be used, which leads to cost reduction. Also, since the check land is exposed when the bottom cover 57 is removed, a check tool with a check prober is placed on the workbench, and the camera with the bottom cover 57 removed is placed on the check tool. Circuit connection can be performed while operating various dials on the upper cover. Further, the stability of the whole camera is improved since the camera bottom area is increased in front of the camera. Although the volume at the bottom of the camera increases, the dimensions from the front of the mount mounting portion, which is the front of the camera, to the rear of the camera (the surface of the back cover) are the same as before, and there is no problem of increasing the size. G. Effects of the Invention According to the present invention, since the space at the bottom of the camera extends from the mount mounting portion to the back of the camera, larger electric components can be accommodated at the bottom of the camera, and the shielding material can be used as in the conventional case. Without using, the influence of noise caused by charging and flashing of the electronic flash device mounted on the camera cover can be reduced, and workability is improved because it is not necessary to disconnect the various setting dials on the camera cover when checking electrical components I do. Furthermore, since the bottom area of the camera bottom increases in front of the camera, the stability of the camera is improved. Furthermore, in the viewfinder replaceable camera, there is no need to disperse and arrange the electric components, and the number of components and the number of assembly steps can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are a front view and a II-II plan view of FIG. 1 showing a first embodiment of the present invention. FIGS. 3 and 4 correspond to FIGS. 1 and 2, respectively. 2: Penta prism, 3: Top cover 4: Mount, 51: Circuit board 51a: IC, 55: Mount mount 56: Camera bottom, 57: Bottom cover

Claims (1)

(57) [Claims] In a single-lens reflex camera in which a mount mounting portion is protruded substantially at the center of the front of the camera, a space for accommodating electric components is formed at the bottom of the camera,
The space extends in the front-rear direction of the camera from the mount mounting portion to the rear surface of the camera, a front surface of the camera bottom portion is at least substantially flush with the mounting portion, and a rear surface of the bottom portion is at least substantially flush with the rear surface of the camera. As one aspect, a bottom structure of a single-lens reflex camera, wherein a distance between a front surface and a rear surface of the camera bottom is maintained at least equal to a distance between the mounting portion and the camera rear surface. 2. The bottom structure of a single-lens reflex camera according to claim 1, wherein a bottom cover for covering the space is provided detachably on the bottom of the camera.