GB2177809A - Full or half frame exposure - Google Patents

Abstract

On lateral movement of a knob 103, two partial masking doors 105 are opened for changing the exposure from half to full frame and a pivotally movable plate 112 is removed from potential engagement with two opposed upper cam lobes 203 mounted on a film winding spindle 204, a laterally movable plate 110 remaining in potential engagement with a single lower cam lobe 203, whereby the film advance is changed from half to full rate. <IMAGE>

Description

SPECIFICATION An improved device for camera This invention relates to an improvement for camera, particularly can take 36 pictures or 72 pictures with a roll film of 36 exposures if necessary.

This invention relates to an improvement device for camera, which not only can have a roll of film taken 36 exposures, but also can take 72 exposures.

The various kinds of current conventional cameras can not have any choice in their exposures, i.e. a camera designed for 36 exposures can only take 36 pictures. Some cameras can take 72 pictures with 36 exposures of film. The camera according to the present invention possesses both the aforesaid functions so as to provide a camera user with a choice in taking picture, i.e. the camera may take a picture with a full-size exposure or a half-size exposure, if necessary; therefore, it is deemed a novel and practical design.

The object of the present invention is to provide a camera with an improved device, by which the camera can take a picture with a full-size exposure or a half-size exposure, i.e. a roll film of 36 exposures may take 36 or 72 pictures, if so desired.

An embodiment of this invention is described, by way of example, with reference to the drawings in which: Figure 1 is a disassembled view of the present invention.

Figure 2 is a top view and a front view of the operation mechanism for feeding a halfsize exposure in the present invention.

Figure 3 is a top view of the operation mechanism for feedig a full-size exposure.

Referring to Fig. 1, there is shown an adapting plate 102 on the top of the dark chamber 101 in the camera body; the adapting plate 102 is furnished with a control knob 103 for moving the adapting plate back and forth.

Upon the adapting plate 102 being moved in direction A, the two rotary cranks 104 will rotate in direction B. Since the rotary cranks 104 are linked with the skew quadrilateral plates 106 on the dark chamber door 105 respectively, the dark chamber doors 105 will be opened by the skew quadrilateral plates 106 upon the rotary crank rotating. In that case, a full-size exposure in the dark chamber 101 will be exposed to a picture; for instance, a roll film of 36 exposures can be used for taking 36 pictures. Upon the adapting plate 102 being moved to its original position, the rotary crank 104 will rotate to its original position, and the skew quadrilateral plates 106 will also be pulled back to its original position by spring 107 so as to close the dark chamber doors 105.In that case, only a half-size exposure can be used, i.e., a roll film of 36 exposure may be used for taking 72 pictures.

The adapting plate 102 is furnished with a notch 1021 which can be engaged with a round stud 108 so as to limit the movement of the adapting plate 102. A U-shaped plate 109 is also furnished to limit the adapting plate 102 to move horizontally only. On the U-shaped plate 109, a control plate for feeding a full-size film 110 is installed, and it can automatically return to its original position by a spring 111 upon winding the film; further, a control plate for feeding a half-size film 112 is loosely mounted on the control plate 110 with a screw 113 so as to rotate freely, and the control plate 112 is also mounted with a spring 114.

Referring to Fig. 2, there is shown a lateral arm 201 on the control knob 103 for driving a stud 202 on the control plate 112 so as to have the control plate 112 separate from a cam 203, if necessary. The cam 203 is fixedly mounted on a winding spindle 204; the upper half portion of the cam 203 is provided with two lobes, which can be in contact with the control plate 112; therefore, upon the winding spindle 204 rotating a half turn, a half-size exposure will be fed in position. The lower half portion of the cam 203 is furnished with a single lobe, which can be in contact with the control plate 110. Upon the control plate 112 being separated from the cam 203 as shown in Fig. 3, the winding spindle 204 can feed one full-size exposure after rotating each turn.

Upon the control knob 103 not moving as shown in Figs. 1 and 2, the dark chamber doors 105 are in closed state; in that case, only a half-size exposure can be used (as mentioned above), and simultaneously, a halfsize exposure can be fed after the winding spindle 204 rotating a half turn; therefore, a full-size exposure can be divided into two half exposures for two pictures respectively, i.e., a roll film of 36 exposures can be converted into 72 exposures.Upon the control knob 103 driving the adapting plate 102 to move in direction A, the dark chamber doors 105 will be opened to have a full-size exposure fed in position (as mentioned above); simultaneously, the lateral arm 201 on the control knob 103 will drive the control plate for feeding a halfsize exposure 112 to disengage from the cam 203 as shown in Fig. 3, in which only the control plate 110 is in engagement with the cam 203; in that case, a full-size exposure will be fed in position upon the winding spindle 204 being rotated on turn, i.e., a roll film of 36 exposures can take 36 pictures.

It is deemed that the present invention is simple and novel in structure, and convenient to the user, who can have a choice in taking a given number of picture if necessary.

1. An improved device for camera comprising:

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (1)

1. **WARNING** start of CLMS field may overlap end of DESC **.

   SPECIFICATION An improved device for camera This invention relates to an improvement for camera, particularly can take 36 pictures or 72 pictures with a roll film of 36 exposures if necessary.

   This invention relates to an improvement device for camera, which not only can have a roll of film taken 36 exposures, but also can take 72 exposures.

   The various kinds of current conventional cameras can not have any choice in their exposures, i.e. a camera designed for 36 exposures can only take 36 pictures. Some cameras can take 72 pictures with 36 exposures of film. The camera according to the present invention possesses both the aforesaid functions so as to provide a camera user with a choice in taking picture, i.e. the camera may take a picture with a full-size exposure or a half-size exposure, if necessary; therefore, it is deemed a novel and practical design.

   The object of the present invention is to provide a camera with an improved device, by which the camera can take a picture with a full-size exposure or a half-size exposure, i.e. a roll film of 36 exposures may take 36 or 72 pictures, if so desired.

   An embodiment of this invention is described, by way of example, with reference to the drawings in which: Figure 1 is a disassembled view of the present invention.

   Figure 2 is a top view and a front view of the operation mechanism for feeding a halfsize exposure in the present invention.

   Figure 3 is a top view of the operation mechanism for feedig a full-size exposure.

   Referring to Fig. 1, there is shown an adapting plate 102 on the top of the dark chamber 101 in the camera body; the adapting plate 102 is furnished with a control knob 103 for moving the adapting plate back and forth.

   Upon the adapting plate 102 being moved in direction A, the two rotary cranks 104 will rotate in direction B. Since the rotary cranks 104 are linked with the skew quadrilateral plates 106 on the dark chamber door 105 respectively, the dark chamber doors 105 will be opened by the skew quadrilateral plates 106 upon the rotary crank rotating. In that case, a full-size exposure in the dark chamber 101 will be exposed to a picture; for instance, a roll film of 36 exposures can be used for taking 36 pictures. Upon the adapting plate 102 being moved to its original position, the rotary crank 104 will rotate to its original position, and the skew quadrilateral plates 106 will also be pulled back to its original position by spring 107 so as to close the dark chamber doors 105.In that case, only a half-size exposure can be used, i.e., a roll film of 36 exposure may be used for taking 72 pictures.

   The adapting plate 102 is furnished with a notch 1021 which can be engaged with a round stud 108 so as to limit the movement of the adapting plate 102. A U-shaped plate 109 is also furnished to limit the adapting plate 102 to move horizontally only. On the U-shaped plate 109, a control plate for feeding a full-size film 110 is installed, and it can automatically return to its original position by a spring 111 upon winding the film; further, a control plate for feeding a half-size film 112 is loosely mounted on the control plate 110 with a screw 113 so as to rotate freely, and the control plate 112 is also mounted with a spring 114.

   Referring to Fig. 2, there is shown a lateral arm 201 on the control knob 103 for driving a stud 202 on the control plate 112 so as to have the control plate 112 separate from a cam 203, if necessary. The cam 203 is fixedly mounted on a winding spindle 204; the upper half portion of the cam 203 is provided with two lobes, which can be in contact with the control plate 112; therefore, upon the winding spindle 204 rotating a half turn, a half-size exposure will be fed in position. The lower half portion of the cam 203 is furnished with a single lobe, which can be in contact with the control plate 110. Upon the control plate 112 being separated from the cam 203 as shown in Fig. 3, the winding spindle 204 can feed one full-size exposure after rotating each turn.

   Upon the control knob 103 not moving as shown in Figs. 1 and 2, the dark chamber doors 105 are in closed state; in that case, only a half-size exposure can be used (as mentioned above), and simultaneously, a halfsize exposure can be fed after the winding spindle 204 rotating a half turn; therefore, a full-size exposure can be divided into two half exposures for two pictures respectively, i.e., a roll film of 36 exposures can be converted into 72 exposures.Upon the control knob 103 driving the adapting plate 102 to move in direction A, the dark chamber doors 105 will be opened to have a full-size exposure fed in position (as mentioned above); simultaneously, the lateral arm 201 on the control knob 103 will drive the control plate for feeding a halfsize exposure 112 to disengage from the cam 203 as shown in Fig. 3, in which only the control plate 110 is in engagement with the cam 203; in that case, a full-size exposure will be fed in position upon the winding spindle 204 being rotated on turn, i.e., a roll film of 36 exposures can take 36 pictures.

   It is deemed that the present invention is simple and novel in structure, and convenient to the user, who can have a choice in taking a given number of picture if necessary.

   1. An improved device for camera comprising: a control knob being used for moving an adapting plate, and said control knob being furnished with a lateral arm; two rotary cranks being driven with said adapting plate; a U-shaped plate being fixed on the dark chamber of the camera body so as to limit said adapting plate to move horizontally only; two dark chamber doors being mounted on said dark chamber, and said dark chamber doors being furnished with two skew quadrilateral plates respectively; a control plate for feeding a full-size exposure being mounted on said U-shaped plate, and said plate being moved laterally and horizontally; a control plate for feeding a half-size exposure being mounted on said control plate for feeding a full-size exposure, and said half-size exposure control plate being able to move freely around its mounting point; and a cam with two lobes on its upper half portion, and with a single lobe or its lower half portion, and said cam being mounted on the winding spindle; and said control plate for feeding a half-size exposure being engaged with said two lobes on the upper half portion of said cam; and said control plate for feeding a full-size exposure being engaged with said single lobe on the lower half portion of said cam; and when said control knob driving said adapting plate to move, said rotary crank starting to rotate to touch the skew quadrilateral plates to have said dark chamber doors opened to provide a full-size exposure; and simultaneously, the lateral arm of said control knob driving the stud on said control plate of for feeding a half-size exposure so as to have said control plate for feeding a half-size exposure separated from said cam, and the one full-size ex posure being fed in position after said winding spindle rotating one turn; and after said con trol knob being pushed back to its original position, said rotary crank also returning to its original position; and said skew quadrilateral plates being pulled back to their original positions respectively with springs so as to close said dark chamber doors and to provide a half-size exposure; and said control plate for feeding a half-size exposure being pulled back to its original position by a spring to contact with the upper half portion of said cam so as to fed a half-size exposure after said winding spindle rotating a half turn.