Nikon Corporation

Makoto Matsuzaki

Seiichi Yasukawa

Yoshiharu Inoue

A motor drive control device which drives a motor in accordance with a pulse width modulated input signal, a first binary signal indicating a rotation direction for driving the motor and a second binary signal indicating whether drive of the motor is ON or OFF. The motor drive control device includes a logic circuit receiving the pulse width modulated input signal, the first binary signal and the second binary signal and, in response, producing a first pulse width modulated output signal and a second pulse width modulated output signal which together indicate a rotation direction and rotation speed for driving the motor.

Motor drive control device which uses pulse width modulation to control

A photometric device that makes improved accuracy of screen photometry possible is disclosed. The photometric device includes a screen component that transmits a luminous flux from a subject field, a light emitting indicating device that is placed in the vicinity of the screen component and that indicates light emitting photographic information, and a photometry component that receives the transmitted luminous flux and outputs the received luminous flux as a first photometric value of the subject field. The photometric device is equipped with an adjustment device that determines a second photometric value based on a higher order or non-linear function of the first photometric value that differs from the first photometric value by a photometric value adjustment amount to compensate for the emitted light of the light emitting indicating device.

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Yokosuka, Japan

Makoto Matsuzaki