JPH0669949U - Screen size switching mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] A screen size switching mechanism for cameras that has a simple structure of two light-shielding parts and has no error in movement of the light-shielding parts. [Structure] Two light-shielding portions 1a and 1b facing each other are formed by folding back and supporting an integral light-shielding member 1. When one end of the light blocking member 1 is slid against the spring 4 by the actuating member 50, the light blocking portions 1a and 1b move to the outside of the screen 100, and the light blocking member 1 is locked in this state to lock the normal screen 100. It is possible to switch the screen size to.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mechanism for switching a screen size, which is provided in a camera body for capturing an image such as a panoramic screen, which is a special screen partitioned into a shape different from the standard screen.

[0002]

[Prior art]

 For example, in a conventional screen size switching mechanism as disclosed in Japanese Patent Application No. 2-278335, two upper and lower light blocking members and a driving member for changing the position and angle of the light blocking members. Was composed of a plurality of members.

[0003]

[Problems to be solved by the device]

 In the conventional film screen size switching mechanism, the upper and lower light-shielding members and the driving member are composed of a plurality of members, which are combined to form a complicated structure. In addition, there is a problem in that the drive member and the light blocking member may not work together, resulting in an error.

Therefore, the present invention has a simple structure, and an object thereof is to eliminate the error of interlocking and enable the switching of the screen size.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in a screen size switching mechanism that shields both ends of two opposite sides of the screen in order to change the exposure range of the shooting screen, both sides of the two opposite sides are shielded simultaneously. A single light-shielding member having two light-shielding portions and an actuating member for moving the two light-shielding portions forward and backward are provided at the both end portions, and the light-shielding member is reciprocally operated so that the light-shielding portion is at the both end portions. Switch back and forth to switch the screen size. Alternatively, the light shielding member is combined at a plurality of portions to be substantially integrated.

[0006]

[Action]

 According to the configuration of the present invention, since the light-shielding portions facing each other are substantially integrated, the two light-shielding portions can be operated symmetrically, so that the movement amount of the light-shielding portions facing each other can be reduced. There is no error and the screen size can be switched.

[0007]

【Example】

 Hereinafter, the details of the present invention will be described with reference to the preferred embodiments shown in the accompanying drawings. FIG. 1 shows the state of the normal photographing screen, and FIG. 2 shows the state of the special photographing screen. FIG. 3 is a development view of the light shielding member 1. The light-shielding member 1 has two light-shielding portions 1a and 1b, and the light-shielding portions 1a and 1b are formed so as to face each other with respect to the screen by pivotally supporting the folded portion by the shaft 2. The light shielding member 1 is provided with a guide groove 1c, and is fixed by a guide pin 3 in a slidable state with respect to the screen. Springs 4 are hooked on spring hooks 1d provided at both ends of the light blocking portion 1a of the light blocking member 1. As a result, the light shielding member 1 is biased by the spring 4 in such a direction that the light shielding portions 1a and 1b facing each other come close to each other and enter both ends of the screen. A part of the light shielding member 1 is connected to the operating member 50.

Next, the operation of this embodiment will be described. In normal photographing, as shown in FIG. 1, the light blocking member 1 is locked by a locking member (not shown) with the light blocking portions 1a and 1b facing each other outside the screen 100. For example, when performing special screen photography such as a panoramic screen, the locking member that locks the light blocking member 1 is unlocked by rotating the operating member 50. The light shielding member 1 slides in parallel with the screen 100 by the guide pin 3 and the guide groove 1c by the biasing force of the spring 4. Therefore, the light shielding portions 1a and 1b slide in the directions in which they approach each other. The light shielding portions 1a and 1b are stopped at predetermined positions by the guide pin 3 and the guide groove 1c. As a result, as shown in FIG. 2, the light-shielding portions 1a and 1b shield unnecessary portions. As a result, the upper and lower portions of the screen 100 are shielded from light, and only the special screen portion 100a shown by the shaded area is exposed, so that the special screen can be photographed.

To switch from the special screen shooting to the normal shooting screen, by rotating the actuating member 50, one end of the light blocking member 1 is pulled in the direction opposite to the biasing direction of the spring 4, and the light blocking portion 1 a, 1b slides away from each other and move to the outside of the screen 100. By locking the light blocking member 1 with a locking member (not shown), a normal screen can be photographed. According to this embodiment, since the light-shielding portions 1a and 1b facing each other are integrally formed, there is no error due to interlocking, and the movement amounts of the light-shielding portions 1a and 1b facing each other are symmetrical and move equally.

[0010]

[Other Examples]

 As shown in FIG. 4, the light-shielding member 11a and the light-shielding member 11b are connected by a connecting member 12 to form a substantially integrated structure, and the light-shielding members 11a and 11b serve as the light-shielding portions 1a and 1b. Also, although not shown above, by providing two types of locking parts in addition to the normal size locking part, it is possible to capture images in three screen sizes, usually special screen 1 and special screen 2. Become.

Although the movement of the light-shielding portion in the above embodiment is described in the vertical direction with respect to the screen, the light-shielding portion may be slid in the horizontal direction with respect to the screen.

[0012]

[Effect of device]

 According to the configuration of the present invention, since the light-shielding portion is substantially integrated and simple, the movement amounts of the two light-shielding portions facing each other are the same and there is no interlocking error, and the screen size can be switched. is there.

[Brief description of drawings]

FIG. 1 is a front view of a main part of an embodiment showing a normal screen image capturing of the present invention.

FIG. 2 is a front view of a main part of an embodiment showing a special screen image capturing of the present invention.

FIG. 3 is a development view of a light blocking member of the present invention.

FIG. 4 is a front view of the essential parts of the second embodiment of the present invention, showing a normal screen shooting.

[Explanation of symbols]

 1, 11a, 11b Light-shielding member 1a, 1b Light-shielding part 2 Shaft 12 Connecting member 50 Operating member 100 Screen 100a Special screen part

Claims (2)

[Scope of utility model registration request] 1. A screen size switching mechanism for shielding both end portions of two opposite sides of a screen for changing an exposure range of a photographing screen, and two portions of light shielding for simultaneously shielding both end portions of the opposite two sides. A single light-shielding member having a portion and an actuating member for actuating the two light-shielding portions to move forward and backward at both end portions are provided, and the light-shielding member is reciprocally operated by the actuating member so that the light-shielding portion has both ends. A screen size switching mechanism that moves the screen forward and backward to switch the screen size. 2. The screen size switching mechanism according to claim 1, wherein the light shielding member is connected at a plurality of portions and is substantially integrally formed.