Image pickup apparatus with a rotary shutter
First Claim
1. In an image pickup apparatus with a rotary shutter having sector blades disposed in the path of image-forming light traveling to an image-sensing means to define the amount of time the image-forming light strikes the image-sensing means, and means to scan said image-sensing means with scanning signals including a periodic vertical synchronizing signal to provide photoelectric output signals as image information which in turn are transferred to an image-forming means;
- the improvement comprising;
means for generating pulse signals representing the starting of opening of said rotary shutter whose pulse repetition rate changes correspondingly to the speed of rotation of said rotary shutter;
means for detecting the occurrence of a phase difference between said vertical synchronizing signals and said pulse signals, said detecting means providing an operation signal when there is no said phase difference; and
switching means actuated by said operation signal from said detection means for permitting said image-forming means to form images based on said photoelectric output signal from said image-sensing means.
1 Assignment
0 Petitions
Accused Products
Abstract
An image pickup apparatus using an image sensor is provided with a rotary shutter that controls the amount of time the image-forming light strikes the image sensor. A synchronism detector is provided to detect the phase difference between the rotation of the rotary shutter and the scanning of the image sensor by comparing the phase signals produced according to the speed of rotation of the rotary shutter and vertical synchronizing signals periodically produced as well as scanning signals for scanning the image sensor. When there is no phase difference between the two signals, the synchronism detector provides an operation signal which causes a switching circuit to be conductive, so as to permit an image recorder to record images. On the other hand, if there is a phase difference, the synchronism detector provides no operation signal and the switching circuit is rendered non-conductive so as to prevent the image recorder from recording images.
11 Citations
11 Claims
-
1. In an image pickup apparatus with a rotary shutter having sector blades disposed in the path of image-forming light traveling to an image-sensing means to define the amount of time the image-forming light strikes the image-sensing means, and means to scan said image-sensing means with scanning signals including a periodic vertical synchronizing signal to provide photoelectric output signals as image information which in turn are transferred to an image-forming means;
- the improvement comprising;
means for generating pulse signals representing the starting of opening of said rotary shutter whose pulse repetition rate changes correspondingly to the speed of rotation of said rotary shutter; means for detecting the occurrence of a phase difference between said vertical synchronizing signals and said pulse signals, said detecting means providing an operation signal when there is no said phase difference; and switching means actuated by said operation signal from said detection means for permitting said image-forming means to form images based on said photoelectric output signal from said image-sensing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- the improvement comprising;
-
10. In an image pickup apparatus with a rotary shutter having sector blades disposed in the optical path of image light traveling to an image-sensing means to define the amount of time the image-forming light strikes the image-sensing means, said image-sensing means being comprised of a large number of photoelectric conversion elements for converting light into electric charges, and means for scanning said image-sensing means with scanning signals including a periodic vertical scanning signal to retrieve from the respective photoelectric conversion elements image signals which in turn are transferred to an image-recording means including a magnetic recording medium;
- the improvement comprising;
a phase detector for generating a phase pulse with a constant duration whose repetition rate varies as the speed of rotation of said sector blades; means for detecting a phase difference between said phase pulse and said vertical scanning signal; and a switching circuit controlled by said detecting means that is rendered conductive when said detecting means detects no said phase difference, said switching circuit being disposed between said image sensing means and image recording means so as to permit the transfer of said image signals therebetween when said switching circuit is conductive. - View Dependent Claims (11)
- the improvement comprising;
Specification