Auxiliary power source device for motor driven camera

• US 4,427,280 A
• Filed: 02/17/1982
• Issued: 01/24/1984
• Est. Priority Date: 02/24/1981
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Watanabe, Yoshitaka, Fukahori, Hidehiko, Iwashita, Tomonori, Mashimo, Yukio
• Primary Examiner(s): ADAMS JR, RUSSELL E
• Application Number:
  US06/349,458
• Time in Patent Office: 706 Days
• Field of Search: 354/173, 354/295, 307/46, 307/52
• US Class Current: 396/303
• CPC Class Codes: G03B 17/425 motor drive cameras

Abstract

An auxiliary power source device to be connected in series to the power source of the motor driven device built in the camera or attachable on the camera so as to increase the winding speed of the camera, so designed that the auxiliary power source device is provided with the load current detecting means in such a manner that the current delivered from the auxiliary power source device to the camera reaches a certain determined value the output voltage of the auxiliary power source device is lowered by means of the output of the load current detecting means.

Claims

1. An auxiliary power source device for a motor driven camera comprising:

an auxiliary power source;

a terminal for connecting the auxiliary power source to the power source of the motor driven camera so as to supply current to the winding motor of the motor driven camera;

detecting means to be connected between the auxiliary power source and the terminals so as to detect the load current to the winding motor; and

mens for lowering the voltage applied to the winding motor by means of the output of the detecting means when the detecting means detects that the load current reaches a predetermined value.

2. A device in accordance with claim 1, wherein the means for lowering the voltage includes a transistor and lowers the voltage to be applied to the winding motor by changing the output of the transistor.

3. A device in accordance with claim 2, wherein the detecting means includes a second transistor, which controls the output of the first transistor when the load current of the winding motor reaches the predetermined value.

4. An auxiliary power source device for a motor driven camera comprising:

an auxiliary power source;

a first terminal for connecting the auxiliary power source to the power source of the motor driven camera;

a second terminal for connecting the auxiliary power source is the winding motor;

detecting means to be connected between the first terminal and the auxiliary power source so as to detect the output current of the auxiliary power source, said means producing a signal when the output current reaches a predetermined value; and

voltage control means to be connected between the second terminal and the auxiliary power source, so as to lower the output voltage of the auxiliary power source by means of a signal from the detecting means.

5. A device in accordance with claim 4, wherein the detecting means includes a resistor connected between the first terminal and the auxiliary power source, and a first transistor with a base and an emitter connected by the resistor, and the voltage control means includes a second transistor with a base connected to the collector of the first transistor and with an emitter and collector connected between the second terminal and the auxiliary power source.

6. An auxiliary power source device for motor driven camera comprising:

an auxiliary power source including;

(a) an auxiliary power source;

(b) detecting means for detecting the output current from the auxiliary power source, said means producing a detecting signal when the output current reaches a predetermined value; and

(c) voltage control means for controlling the output voltage of the auxiliary power source, said means lowering the output voltage of the auxiliary powder source by means of the detecting signal of the detecting means;

a motor driven camera on which the auxiliary power source device is mountable, said camera including;

(d) a power source;

(e) a winding motor;

(f) motor control means connected between the motor nd the power source; and

(g) change over means to be changed over between a first position at which only the power source is connected to the motor and a second position at which the power source connected to the auxiliary power source is connected to the motor, said means being changed over to the second position by mounting the auxiliary power source.