JPH09274240A - Image pickup device, screen device for finder and image pickup system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unnecessary power supply and to restrain the consumption of a battery by discriminating whether electronic parts are attached to an image pickup device from an abutting state between a contact pin and a contact fitting. SOLUTION: A discriminating contact pin 24 is provided in a camera body and pressed to the contact metal fittings 8f by a contact spring 25 similarly to the discriminating contact pin 21f so as to form an electric connection state. When the pin 24 is connected with the pin 21f through the fitting 8f, that is, in the case the pin 24 is connected to a ground line, the camera body recognizes that the attached screen has a display member 3. Namely, the fittings 8f are common to a segment on the display member 3 and also functions as the ground line of the pin 24. Therefore, whether the screen is attached is discriminated on a camera side without providing a new member on the screen side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system including an image pickup device and a detachable finder screen device, an image pickup device, and a screen device.

[0002]

2. Description of the Related Art In a single-lens reflex camera, various screens are used for focusing an image of an object by focusing it. Various types of screens are prepared, and they are selectively attached to a single-lens reflex camera for use depending on the shooting application or the photographer's preference. Further, a display member, such as a liquid crystal (hereinafter LCD) or an electrochromic element (hereinafter EC), provided with a segment having a predetermined shape is arranged on a transparent glass plate adjacent to the image plane of the subject image, and the segment is arranged. It has been proposed to display various photographing information by turning on, blinking, or extinguishing so as to be visible at the same time as the subject image. The applicant of the present invention has also put it into practical use, 63-168423.
No. etc. have been filed.

[0003]

However, in the case of a screen in which a display member of this kind is arranged,
It is necessary to apply a voltage to the segment of the display member from the camera body side to turn on, blink, or turn off the segment.

On the other hand, when a screen without a display member is attached to the camera body, it is not necessary to apply a voltage to the screen from the camera body side as described above, but rather the application of voltage does not drain the battery. It is desirable in terms of prevention.

Further, it is needless to say that it is preferable not to apply a voltage when neither screen is attached.

Therefore, in the camera body, it is determined whether or not the attached screen is the screen having the display member, and the voltage is applied from the camera body side only when the screen having the display member is attached. It is necessary to take a method.

The present invention has been made in view of the above problems, and it is an object of the present invention to avoid unnecessary power supply and suppress battery consumption.

[0008]

In order to achieve this object, a first aspect of the present invention relates to an image pickup device (10) and a plurality of contacts (8a to 8a) which are detachable from the image pickup device and include a ground terminal.
An image pickup system comprising an electronic component (1) having a display means including f), wherein the image pickup device has contact pins (21f, 24) in contact with a contact, and contact states of a ground terminal and the contact pin. And a determination unit that determines the mounting state of the electronic component and the imaging device based on the above.

In the second aspect of the invention, an electronic component having a display means having a plurality of contact groups (8a to 8f) including a ground terminal is attachable / detachable, and a contact pin (21) that abuts the contact group.
f to 24), and a discriminating means for discriminating the mounting state of the electronic component based on the connection state of the ground terminal and the contact pin.

A third invention is a condenser lens (4),
A viewfinder screen device (1) comprising a focusing screen (2) disposed below a condenser lens, comprising:
A holding member (1a, 1b) for holding the screen device is provided, and in the peripheral portion of the focusing screen, the side facing the condenser lens projects in the circumferential direction of the focusing plate, and the side opposite to the side facing the condenser lens is recessed. A step portion (2d) is provided, and the holding member has a protruding portion (1ah) that enters the convex portion of the step portion.

A fourth invention is a condenser lens (4),
A viewfinder screen device (1) comprising a focusing screen (2) disposed below a condenser lens, comprising:
A holding member (1b) for holding the screen device, an electric display element (3) arranged between the condenser lens and the focusing screen and electrically displaying various information, and a contact member (for electrically connecting the electric display element). 18, 8a to 8f), and the holding member (1b) includes an accommodating portion (1c) that accommodates the contact point member (8f2).

A fifth invention is a condenser lens (4),
A viewfinder screen device (1) comprising a focusing screen (2) disposed below a condenser lens, comprising:
A holding member (33) for holding the screen device is provided, and the holding member includes a protruding portion (33) that projects toward the side opposite to the screen device in the vicinity of the upper end portion.

A sixth invention is a condenser lens (4),
A viewfinder screen device (1) comprising a focusing screen (2) disposed below a condenser lens, comprising:
A first member (1b) that contacts the screen device to hold the screen device, a second member (1a) that contacts the surface of the first member opposite to the screen device side, a condenser lens and a focusing screen. An electric display element (3) arranged between the electric display element and the second member for electrically displaying various information, and provided with an elastic restoring force in a predetermined direction (A), are provided between the electric display element and the second member. The second member is fixed to the first member by a coupling force in a direction substantially orthogonal to the predetermined direction.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a horizontal sectional view of a screen to which the present invention is applied mounted on a camera body. FIG.
Shows a partially enlarged view of FIG. 1. FIG. 3 is a vertical sectional view in the center of the camera body when the screen to which the present invention is applied is mounted on the camera body. FIG.
FIG. 4 shows a vertical sectional view in a direction orthogonal to FIG. 3. FIG.
A partially enlarged view of FIG. FIG. 6 shows a side view of the contact portion of the screen to which the present invention is applied.

The screen 1 is attached to the camera body 10 (FIG. 3), and the subject image can be observed through the finder 13. The subject light that has passed through the taking lens 11 is reflected by the quick return mirror 12,
An image is formed on the matte surface 2a (FIG. 4) of the focusing screen 2. A Fresnel lens is arranged on the eyepiece-side surface 2b of the focusing screen 2 so that the subject image formed on the matte surface 2a can be visually recognized at an eye point. Display member (LCD or E
C and the like) 3 is a transparent glass plate on which segments 5a to 5e indicating photographing information are arranged. Further, a condenser lens 4 (FIG. 3) is arranged on the eyepiece side of the display member 3.

On the end portion 3e (FIG. 1) of the display member 3, electrodes 6a to 6e for applying positive and negative voltages to the segments 5a to 5e and an electrode 6f which is a common terminal of the segments 5a to 5e are provided. It is arranged. Segments 5a-5e
And the common terminal is an elastically conductive member 7 that is elastically deformable.
The electrodes 6a to 6f are connected via (FIG. 5). The electrodes 6a to 6f are end portions 8a1 to 8f1 of U-shaped contact fittings 8a to 8f arranged on the side surface portion 1a of the screen.
Is electrically connected to

Next, a method of assembling the screen 1 will be described.

First, in the screen frame 1b of the screen 1,
The condenser lens 4, the display member 3, and the focusing screen 2 are
It is loaded in the direction of arrow A in FIG. 5 and fixed by means not shown. It should be noted that a constant gap (gap) is provided between the condenser lens 4 and the display member 3, and between the display member 3 and the focusing screen 2. Next, the side surface 1a is indicated by the arrow
And is fixed by screws 9a and 9b (FIG. 5). The elastic conductive member 7 is the display member 3
And the contact metal fittings 8a to 8f are crushed and elastically deformed. The restoring force due to the elastic deformation of the elastic conductive member 7 acts in a direction parallel to the arrow A in FIG. 5, and acts in a direction orthogonal to the tightening direction of the screws 9a and 9b. Therefore, the restoring force is screw 9a and 9
It is not affected by the tightening of b, in other words, the elastic conductive member 7 is brought into close contact with the electrodes 6a to 6f and the contact fittings 8a to 8f on the display member 3 with a constant and stable force.

At the lower part of the side surface portion 1a, there is a projecting portion 1ah projecting in the direction of the focusing screen 2 (FIG. 5), and the bank portion 2 of the focusing screen 2 is inserted into the projecting portion 1ah.
d is overhanging. The upper surface of the bank portion 2d is in close contact with the lower surface 3a of the display member 3, and in this state, the entire focusing screen 2 is pressed upward in FIG. 5 by a supporting member (not shown). This maintains the close contact between the upper surface of the bank portion 2d and 3a, and prevents dust and the like from entering the space between the display member 3 and the focusing screen 2 from the outside (configuration and effect of claim 6).

Between the overhang portion 1ah and the bank portion 2d,
A slight gap is provided so that the overhanging portion 1ah does not press the focusing screen 2 against the display member 3 with an unnecessary force. The shape of the gap depends on how the overhanging portion 1ah and the bank portion 2d are overlapped with each other. The structure is bent so that dust or the like is less likely to enter the elastic conductive member 7 from the outside than the linear gap (the structure and effect of claim 6).

The camera body 10 has contact fittings 8a to 8a.
Contact pins 21a to 21f corresponding to f are provided (FIG. 2). The contact pins 21a to 21f are contact springs 22a.
The contact fittings 8a to 8f are pressed by the urging force of ~ 22f. The contact pins 21a to 21e are connected to the display drive circuit 102 disposed inside the camera body 10, and the contact pin 2
1f is connected to a ground line inside the camera body 10.

Further, the camera body 10 is provided with a discriminating contact pin 24 (FIG. 5), and the contact pins 21a to 21a-2.
Similar to 1f, the contact spring 25 presses the contact fitting 8f to form an electrically connected state. When the determination contact pin 24 is connected to the contact pin 21f through the contact metal fitting 8f, that is, when the determination contact pin 24 is connected to the ground line, the screen 1 attached to the camera body 10 causes the display member 3 to be attached to the screen 1. Recognize that you have.
That is, the contact fitting 8f is the segment 5a on the display member 3.
It is common to 5e and also serves as the ground line of the discrimination contact pin 24.

FIG. 7 is a block connection diagram showing the configuration of a camera using the present invention.

In the camera body 10, segments 5a to 5e on the control and display member 3 associated with photographing are lit,
An arithmetic circuit 101 for controlling blinking and extinguishing is mounted.

When the photographer selects a display with the display selection mechanism 103, the arithmetic circuit 101 determines the segment to be lit according to the selection, and the display signal is output to the display drive circuit 102. Display drive circuit 102 receiving the display signal
Is the contact pins 21a to 21e and the contact metal fittings 8a to 8e.
A voltage is applied to one or a plurality of the segments 5a to 5e on the display member 3 via.

The structure of the contact fittings 8a to 8e will be described below.

As shown in FIG. 8, in the initial stage of the manufacturing process, the contact metal fittings 8a to 8e are a series of members 18 connected by the connecting portion 18a, and the member 18 is inserted into the side surface portion 1a of the screen, and thereafter. The connecting portion 18a is cut off to form independent contact fittings 8a to 8f. The cut-off amount is a little amount (specifically 0.1 mm to 1 for ease of work).
The method of leaving is used. Therefore, the end portions 8a2 to 8f2 of the contact metal fittings 8a to 8e and 8f are slightly convex from the side surface portion 1a. Therefore, the ends 8a2-8
In order to avoid interference with f2, the groove 1 is formed on the screen frame 1b.
c (FIG. 5) is formed (structure and effect of claim 8).

Further, as described above, since the discriminating contact pin 24 is arranged for one contact metal fitting (for example, the contact metal fitting 8a), only the contact metal fitting 8a is in contact with the two contact pins, so that only the contact metal fitting is vertical. The length H in the direction is required, and the other contact fittings 8b to 8f need only be long enough to be in contact with one contact pin, and thus may be shorter than the length H. However, in that case, the height of the upper part of the contact fitting reaching the connecting portion 18a is different between 8a and other contact fittings, and a step is formed in the connecting portion 18a. Then, since the above-mentioned cut-off work becomes difficult, in order not to form a step in the connecting portion 18a, it is also necessary to match the contact metal fittings with only one contact pin with the longest length of the contact metal fittings.
This is preferable for simplifying the assembling work (configuration and effect of claim 9).

Next, a case where a screen having no display member is attached to the camera body 10 will be described.

FIG. 9 is a partial sectional view of the camera body 10 with the screen 31 having no display member attached. Unless otherwise specified, members with the same reference numerals have similar configurations and effects.

On the screen 31, the condenser lens 4
Further, the focusing screen 2 is arranged with a constant interval (gap). On the side surface of the screen 31, the camera body 10
There are provided contact pins 21a to 21f provided in the above and escape grooves 32 for avoiding contact with the determination contact pin 24. The upper surface of the escape groove portion 32 has contact pins 21a to 21a.
A protrusion 33 is provided in order to prevent dust and dirt from entering the 21f and the determination contact pin 24 due to a drop (configuration and effect of claim 10).

The operation when the screen 31 is attached to the camera body 10 will be described. The determination contact pin 24 does not come into contact with the screen 31 due to the escape groove portion 32, and thus is not in an electrically connected state with the contact pin 21f. As a result, the camera body 10 determines that the attached screen is a screen having no electrical display means, and the arithmetic circuit 101 does not cause the display drive circuit 102 to output a display signal. Therefore, no voltage is applied to the contact pins 21a to 21e.

Next, a case where the screen is not attached to the camera body 10 will be described. Similar to when the screen 31 is attached, the determination contact pin 24 is the contact pin 2
If the contact pins 21a to 21e are not electrically connected, no voltage is applied to the contact pins 21a to 21e.

As described above, according to the present invention, the camera side can determine that the screen using the display element is mounted without newly providing a member on the screen side. When attached or when the screen is not attached, it is possible to provide a camera system that does not apply an unnecessary voltage, and as a result, it is expected that battery consumption will be suppressed.

As described above, according to the present invention, it is expected that dust and dirt will be prevented from entering between the focusing screen and the display element.

Further, as described above, according to the present invention, even if a small amount of uncut residue remains during molding of the contact fitting, it can be incorporated without interfering with the screen frame. The effect that the metal fittings can be molded is expected.

Further, according to the present invention as described above, even if a screen having no display element is mounted, the contact portion provided on the camera side is covered with the protruding portion of the screen, so that dust and dirt on the contact portion are prevented. The effect of preventing intrusion is also expected.

Further, when assembling the screen having the electric display element, the tightening force for fixing the side portion including the contact fitting is provided by the elastic conductive member provided between the contact fitting and the electrode portion of the electric display element. In other words, the elastic conductive member is crushed by a stable and constant pressure without affecting the restoring force of the contact metal fitting and the electrical display element between the contact metal fitting and the electric display element. An effect of keeping the same is expected (configuration and effect of claim 11).

[0040]

As described above, according to the image pickup system of the present invention, any one of the first electronic component (1) and the second electronic component (31) can be imaged by the contact state of the contact pin and the contact fitting. Since it is configured to determine whether it is attached to
It is possible to avoid unnecessary power supply and reduce battery consumption.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing an embodiment of an image pickup system according to the present invention.

FIG. 2 is a horizontal sectional view showing an embodiment of an image pickup system according to the present invention.

FIG. 3 is a vertical sectional view showing an embodiment of an image pickup system according to the present invention.

FIG. 4 is a sectional view showing an embodiment of an image pickup system according to the present invention.

FIG. 5 is a sectional view showing an embodiment of an image pickup system according to the present invention.

FIG. 6 is a side view showing an embodiment of an imaging system according to the present invention.

FIG. 7 is a block connection diagram showing an embodiment of an imaging system according to the present invention.

FIG. 8 is a perspective view showing an embodiment of an image pickup system according to the present invention.

FIG. 9 is a cross-sectional view showing an embodiment of an imaging system according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 screen 1a side surface 1b screen frame 1c groove 2 focusing plate 2a matte surface 2b surface 2d bank portion 3 display member 3a lower surface 3e end portion 4 condenser lens 5a to 5e segment 6a to 6f electrode 7 elastic conductive member 8a to 8f contact metal fitting 8a1 ~ 8f1 End part 9a Screw 10 Camera body 11 Photographing lens 12 Quick return mirror 13 Finder 18 Member 18a Connecting part 1ah Overhanging part 21a to 21f Contact pin 22a Contact spring 24 Discrimination contact pin 25 Contact spring 31 Screen 32 Groove part 33 Projection part 101 Calculation Circuit 102 Display drive circuit 103 Display selection mechanism

Claims (11)

[Claims] 1. An image pickup device (10) and a plurality of contacts (8a-8) which are detachable from the image pickup device and include a ground terminal.
An image pickup system comprising an electronic component (1) including a display unit including f), wherein the image pickup device includes a contact pin (21) that abuts the contact.
f, 24), and a discriminating unit that discriminates the mounting state of the electronic component and the image capturing apparatus based on the contact state of the ground terminal and the contact pin. 2. The image pickup system according to claim 1, wherein the electronic component is a finder screen, and the contact is connected to an electrochromic element for displaying various information on the finder screen. 3. The image pickup device according to claim 1, wherein the electronic component is a finder screen, and the contact is connected to a common line of a liquid crystal element that displays various information in the finder screen. system. 4. A plurality of contact groups (8a ...
8f) is detachable from an electronic component including a display unit, and the electronic component is based on contact pins (21f to 24) contacting the contact group and a connection state between the ground terminal and the contact pin. An image pickup apparatus, comprising: a discriminating unit that discriminates a mounted state of the. 5. The image pickup apparatus according to claim 4, further comprising a power feeding unit that feeds power to the electronic component, and a control unit that controls the power feeding based on a determination result of the determination unit. 6. A screen device (1) for a finder, comprising a condenser lens (4) and a focusing screen (2) arranged below the condenser lens, the holding member holding the screen device. (1a, 1b)
A step portion (2d) is provided at a peripheral portion of the focusing screen, the side facing the condenser lens protruding in a circumferential direction of the focusing plate, and the side opposite to the side facing the condenser lens is recessed. The screen member for a finder, wherein the holding member has a protrusion (1ah) that enters the protrusion of the step. 7. An electric display element (3) disposed between the condenser lens and the focusing screen for electrically displaying various information, and for contact between the electric display element and the holding member. The screen device for a finder according to claim 6, further comprising: an elastic conductive member (7) provided through the members (18, 18a to 8f) and electrically connecting the electric display element. 8. A screen device (1) for a finder, comprising a condenser lens (4) and a focusing screen (2) arranged below the condenser lens, the holding member holding the screen device. (1b), disposed between the condenser lens and the focusing screen,
An electric display element (3) for electrically displaying various information, and a contact member (18, 8a) for electrically connecting the electric display element.
To 8f), the holding member (1b) includes a housing portion (1c) that houses the contact member (8f2). 9. The contact member (18) comprises comb teeth (8a ...
8f), and each tooth of the comb tooth portion is bent in the same direction at substantially the same position, The screen device for a finder according to claim 8. 10. A screen device (1) for a finder, comprising a condenser lens (4) and a focusing screen (2) arranged below the condenser lens, the holding member holding the screen device. (33), The holding member is provided with a protruding portion (33) protruding toward the side opposite to the screen device in the vicinity of the upper end portion, the screen device for a finder. 11. A screen device (1) for a finder, comprising a condenser lens (4) and a focusing screen (2) arranged below the condenser lens, said finder screen device being in contact with said screen device. A first member (1b) for holding a screen device, and a second member (1a) in contact with a surface of the first member opposite to the screen device side.
And disposed between the condenser lens and the focusing screen,
An electric display element (3) for electrically displaying various information, and an elastic restoring force in a predetermined direction (A), which is provided between the electric display element and the second member and electrically connects the electric display element. And a resilient conductive member (7), and the second member is fixed to the first member by a binding force in a direction substantially orthogonal to the predetermined direction. apparatus.