JPH071626Y2 - Camera screen mounting structure - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a mounting structure of a finder screen having a built-in display element.

B. Conventional Technology A viewfinder screen (hereinafter referred to as a display screen) of a single-lens reflex camera that incorporates a liquid crystal or an electrochromic element (hereinafter, EC) using a transparent electrode has been conventionally proposed. When the shooting information is displayed on the finder screen, the shooting information can be overlaid on the subject image formed on the finder screen from the finder for observation. Further, by electrically changing the transmittance of the finder screen, it is possible to obtain a finder screen suitable for various purposes with one finder screen.

On the other hand, there has been conventionally known a single-lens reflex camera with a replaceable viewfinder screen in which an optimum viewfinder screen is attached according to the purpose of use of the camera.

C. Problems to be solved by the invention Therefore, for example, a signal contact and a power contact are provided in the screen housing portion of the screen exchange type camera, and the above-mentioned display screen and an ordinary screen without EC or liquid crystal (hereinafter, A very useful camera can be realized by properly using the conventional screen) according to the purpose. However, such a camera has not been disclosed so far.

Therefore, the applicant of the present invention has proposed a finder screen mounting structure shown in FIG. 5 in which a display screen or a conventional screen can be selectively mounted. That is, the movable contact 2 is arranged in the screen storage portion 1a provided in a part of the camera body 1, and the movable contact 2 is biased by the spring 3 toward the frame of the screen storage portion 1a. In the case of a display screen, a contact corresponding to the movable contact 2 is provided on the side surface of the screen frame, and
Attach the display screen to 1a so that both contacts are connected. However, in such a structure, as shown in FIG. 5, when the conventional screen 70 is mounted in the screen housing portion 1a, the movable contact 2 rubs against the frame 74 of the conventional screen 70, so that the movable contact 2 contacts the tip portion of the movable contact 2. The paint or the like of the screen frame 74 may adhere to the display screen, causing poor conduction when the display screen is mounted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a screen mounting structure for a camera which solves such a problem by providing a predetermined gap between the screen frame and the movable contact when mounting the conventional screen.

D. Means for Solving the Problems-Explaining with reference to FIGS. 1 to 3 showing an embodiment, the present invention provides a first screen 60 having display elements 62a to 62d and a signal contact 65 thereof. , And a screen mounting structure of a camera capable of mounting the second screen 70 having no display element in the screen housing portion 22, the screen housing portion 22 having a signal contact 31 connected to a signal contact 65, and When the first screen 60 is mounted, both signal contacts 31 and 65 are connected to each other, and when the second screen 70 is mounted, there is a predetermined gap between the signal contact 31 of the screen housing 22 and the second screen 70. Is.

E. Action FIG. 1 When the screen 60 of FIG. 1 is stored in the screen storage portion 22, its fixed contacts 65 are movable contacts of the screen storage portion 22.
Contact 31. When the second screen 70 is housed, a predetermined space is formed between the screen rod 74 and the movable contact 31.

F. Example-First Example-A first example will be described with reference to FIGS. 1 to 3.

FIG. 2 is a vertical cross-sectional view of a central portion of a screen-interchangeable camera to which the present invention can be applied, showing a state in which a subject image can be observed from a finder. Reference numeral 11 denotes a camera body main body, 12 denotes a photographing lens, and the subject light transmitted through the photographing lens 12 has a movable mirror 13 having a semi-transmissive portion partially or entirely.
The light that has been divided into two directions by and is transmitted through the movable mirror 13 is guided by the sub-mirror 14 to the optical block 15 of the AF (autofocus) device and used for focus detection operation. Further, the light reflected by the movable mirror 13 forms a subject image on the focusing screen 61. Here, the glass plate 62 on which the EC pattern is vapor-deposited is adhered to the lower surface of the condenser lens 63 by a known method, and the focusing plate 61, the glass plate 62, and the condenser lens 63 are held by the screen frame 64, and the display screen 60 is It is configured. This display screen 60 is the body of the camera body.
It is stored in a screen storage portion 22 provided on the upper part of 11.

The subject image formed on the focusing screen 61 is observed from the viewfinder eyepiece section 18 by the pentaprism 16 and the eyepiece lens 17. Further, the EC pattern image on the glass plate 62 on which the EC pattern is vapor-deposited is also observed from the viewfinder eyepiece unit 18 overlapping the subject image on the focusing screen 61.

The display element 19 displays shooting information and a focus display that appropriately change according to shooting conditions such as a shutter speed or an aperture value. The optical path elements 19a and 19b display the viewfinder eyepiece section 18
Be led to. Reference numeral 21 is a finder cover that covers the entire finder section.

Next, the finder screen mounting structure will be described.

1 (a) and 1 (b) are a plan view and a cross-sectional view taken along line bb of the screen housing portion 22 showing a state in which the display screen 60 is mounted. A concave portion 22a is formed on one side of the screen housing portion 22, and a movable contact 31 is provided therein. The movable contact 31 is urged by a conductor spring 32 in a direction projecting into the screen housing portion 22, and the tip of the spring 32 is urged.
A connection 34 for driving the EC screen is connected to 32a. 33a and 33b are contact covers on the body side, which cover the contact parts on the body side from the inside and allow water to enter the screen storage unit 22 when used in the rain, etc. Does not reach the other parts, thus playing the role of waterproofing the camera body.

One side of the frame 64 of the display screen 60 is formed as a convex portion 64a having a shape complementary to the concave portion 22a of the screen housing portion 22. The EC pattern 62a deposited on the glass plate 62 is a divided section of divided metering, 62b is a center-weighted metering section, 62c is a spot metering section, and 62d is a data imprinting position. Is connected. When the drive circuit is driven according to the operation of the operation member of the camera, a predetermined EC pattern appears or disappears on the screen. In this embodiment, the information on each pattern on the screen does not change very rapidly during shooting, so that the viewfinder does not become difficult to see even if the information overlaps with the subject image. As other display information,
Aperture value or shutter speed in manual mode, ready light indicating completion of strobe charging, and the like are considered.

The fixed contact 65 on the screen side is compressed and inserted between the non-conductive plastic holder 66 and the terminal 62e of the glass plate 62 by the anisotropic rubber 67 in which the conducting wire 67a is sealed, and is electrically connected to the terminal 62e. Has been done. The plastic holder 66 provided with the fixed contact 65 is provided in the recess 22 of the screen storage portion 22.
It is provided on the screen frame convex portion 64a having a shape complementary to a.
Further, as can be seen from FIG. 1 (b), a sloped surface 64b is provided on the lower side of the convex portion 64a, and when the display screen 60 is inserted into the screen housing portion 22 from above, the sloped surface 64b moves toward the movable contact 31. It is designed to be pushed in smoothly. Therefore, there is no risk of damaging the movable contact 31 during insertion.

That is, in the first embodiment, when the concave portion 22a of the screen storage portion 22 and the convex portion 64a of the screen frame 64 are aligned and the display screen 60 is inserted into the screen storage portion 22, the movable portion is moved.
Both fixed contacts 31 and 65 surely contact each other, and EC patterns 62a to 62
d is driven as needed.

Next, a case where the conventional screen 70 having no EC pattern is inserted into the screen storage portion 22 will be described with reference to FIG.

The movable contact 31 on the body side is the concave portion 22a of the screen storage portion 22.
The screen frame 74 of the conventional screen 70
Since each of the sides is flat, it does not contact the movable contact 31 when the conventional screen is inserted, and therefore, the movable contact 31 and the movable contact 31 do not contact each other while maintaining a predetermined distance, and therefore, paint, dust, etc. It does not adhere.

-Second Embodiment- Next, a second embodiment of the present invention will be described with reference to FIGS. 4 (a) and 4 (b). In this example, no concave portion is provided on the body side, that is, the screen storage portion 22, and the display screen is not provided.
The fixed contact 65 part of 60 is flattened, and also shown in FIG. 4 (b).
As shown in, a concave portion 74a is provided in a portion of the frame 74 of the conventional screen 70 corresponding to the movable contact. Therefore, when the display screen 60 is mounted, its fixed contact 65 makes electrical contact with the movable contact 31. In addition, the conventional screen 70
When the movable contact 31 and the screen frame 74 of the conventional screen 70 do not come into contact with each other when the
No dust or paint adheres to 31.

Although the contacts are provided on the side of the screen housing portion 22 in the above-described embodiments, they may be located at any outer circumference of the screen frame. In addition, in this embodiment, as the display element, EC
Although the display screen 60 using is shown, a display screen using a display element such as a liquid crystal may be used. Further, the movable contact may be provided on the display screen side, and the fixed contact may be provided on the screen housing portion side.

Next, the effect of the embodiment will be described.

(1) If an EC element is used for the display screen 60, the display has a holding property, and it is sufficient to apply a voltage once in one direction at the time of display and once in the opposite direction at the time of disappearance, and apply a voltage during that time. The display does not disappear even if left unattended.
Therefore, the consumption of the power battery is extremely small, and the battery life is improved.

(2) Since the movable contact 31 has the covers 33a and 33b, it has an effect of being resistant to water infiltration.

(3) In the first embodiment, the concave portion 22 of the screen storage portion 22
Since the insertion of the display screen 60 is permitted by combining the a and the screen frame convex portion 64a, there is an effect that the screen 60 is not accidentally inserted in the left-right direction and the operation is easy.

(4) Since the movable contact 31 of the screen accommodating portion 22 is provided in the recess 22a, there is no possibility that the user will accidentally touch it and damage or stain it.

(5) Since the slope 64b is formed at the bottom of the display screen frame 64, the display screen 60 can be mounted smoothly.

(6) In the second embodiment, since the movable contact 31 is provided in the side wall of the screen housing portion 22 without providing the recess, the recess as in the first embodiment is not required, and the device can be downsized. Contribute.

(7) In the first and second embodiments, since the movable contact 31 is pressed from the side of the screen frame 64, this pressure does not move the display screen 60 in the vertical direction of the camera and The plate can be reliably held at a position conjugate with the film surface.

G. Effect of the Invention According to the present invention, when the display screen is inserted into the screen storage part, the contacts of the screen storage part side and the display screen side are in contact with each other, and when the conventional screen is inserted, the screen frame is the screen storage part. Since it does not come into contact with the contact on the side, dust, paint, etc. do not adhere to the contact on the side of the screen storage portion, and the occurrence of defective conduction can be prevented.

[Brief description of drawings]

1 to 3 show a first embodiment of the present invention, FIG. 1 (a) is a plan view of a screen storage portion when a display screen is mounted, (b) is a sectional view taken along line bb thereof, FIG. FIG. 2 is a vertical cross-sectional view of the camera, and FIG. 3 is a plan view of a screen storage portion when a conventional screen is attached. 4 (a) and 4 (b) show a second embodiment of the present invention,
(A) is a plan view of a screen storage part when a display screen is attached, and (b) is a plan view of a conventional screen. FIG. 5 is a plan view showing a case where a conventional screen is attached to the screen storage unit proposed by the present applicant. 11: Camera body 22: Screen housing 22a: Recess, 31: Moving contact 32: Spring, 33a, 33b: Contact cover 60: Display screen, 61: Focus plate 62: Glass plate 62a to 62d: EC pattern 63: Capacitor Lens, 64: Screen frame 64a: Convex part, 65: Fixed contact 66: Holder

Claims (1)

[Scope of utility model registration request] A first display element having a signal contact therefor;
And a second screen not having the display element can be mounted in a screen housing portion of a camera, wherein the screen housing portion has a signal contact connected to the signal contact, When the first screen is mounted, both signal contacts are connected to each other, and when the second screen is mounted, the signal contact of the screen housing and the second screen have a predetermined gap. The camera screen mounting structure.