JPS596668A - Scanning type photoelectric converter - Google Patents

Abstract

PURPOSE:To execute photoelectric conversion efficiently by arraying plural line sensors on a cylindrical body to be rotated synchronously with a vertical synchronizing signal and forming a two-dimensional picture on the cylinder by an optical system to read the formed picture selectively in synchronizing with a horizontal synchronizing signal. CONSTITUTION:The line sensors 20-23 are fitted to the rotary cylindrical body 10 with an equal interval in the direction of a revolving shaft and the cylindrical body 10 is rotated by a synchronous motor 11. Light emitted from a lamp 33 is made incident to a cylindrical lens 30 through a film 40 and an image formation lens and an image is formed on an area corresponding to 1/4 the cylindrical body 10 in the circumferential direction. The formed image is photoelectrically converted through the sensors 20-23 and outputted from an output terminal 14 through a rotary transformer as a time sequence picture signal synchronously with a horizontal synchronizing signal.

Description

[Detailed description of the invention] The present invention relates to a scanning type light awakening conversion device.

In order to display a two-dimensional image formed on a plane on a scanning two-dimensional display device such as a television receiver,
A scanning photoelectric conversion device is required to convert spatially distributed pixel signals into time-series video signals. Although the photoelectric conversion part becomes cheaper, it also requires a mechanism for optical scanning, which makes it difficult to reduce the cost of the entire device.

Conventional optical scanning methods involve wrapping a film around a rotating cylindrical surface, similar to a facsimile, and performing main scanning in the rotational direction and sub-scanning in the rotational axis direction. Image display on the machine (“TV appearance, l
) is difficult to apply to high-speed scanning. One high-speed scanning method is to vibrate a reflector and scan the screen with reflected light, but in this method the rotation angle of the reflector must be changed in a sawtooth waveform over time.
A drawback is that a mechanical response characteristic of an extremely high frequency is required compared to the horizontal scanning frequency 1. In order to eliminate the drawbacks of such vibration or reciprocating scanning method, galvanometer mirror 1
A scanning method is used that mainly involves rotation using a combination of a rotating mirror and multiple fixed mirrors, but the disadvantage is that the optical system is complex and requires a lot of time for sub-alignment during assembly, resulting in high costs. There is.

The present invention has been made in view of the above-mentioned conventional drawbacks,
The purpose is to provide an inexpensive scanning type magneto-optical conversion device (there are two objectives).

That is, the present invention obtains two-dimensional image signals by driving a line sensor for detecting optical information in one-dimensional direction and converting it into a time-series signal in a horizontal direction so that its locus forms the outer peripheral surface of a cylinder. and an imaging lens system including a cylindrical lens for forming a part of the cylindrical outer peripheral surface formed by the locus of the line sensor (= a two-dimensional image). It is a device.

The details of the present invention will be explained below with reference to Examples.

FIG. 1 is a perspective view showing the configuration of an embodiment of the present invention.

Reference numeral 10 denotes a rotating cylindrical body, and on its circumferential surface, four line sensors f20, 21, 22, and 25 extending in the direction of the rotational axis are arranged at equal intervals in the circumferential direction. 1
Rotates in synchronization with the frequency of /4. The motor 11 may be of any suitable type, such as a three-phase synchronous motor, a hysteresis morph motor, a pulse motor, or the like. When broadcasting on TV using interlaced scanning with a frame frequency of 60 Hz, the motor 110 rotation speed is 15 rotations per second (900 r, p,
m, ).

The light emitted from the lamp 65 is transmitted through the condensing lens 32 and the film 4.
0 and enters the cylindrical lens 50 via the imaging lens 61. This cylindrical lens 60 is
It has a uniform concave cross-sectional shape in one direction, and is arranged so that this direction is parallel to the rotation axis of the rotating cylindrical body 10. The image on the film 40 is formed over a quarter area in the circumferential direction on the circumferential surface of the rotating cylindrical body 100. This image is scanned and photoelectrically converted by the line sensors 20 to 26, and becomes a time-series image signal that is sent to the rotary transformer 12.
The signal is output to the output terminal 14 via. Note that various synchronization signals are input to the input terminal 16. The line sensor's subsequent control circuit (two is supplied through the rotary transformer 12).

FIG. 2 shows line sensors 20 to 26 and a rotating cylindrical body 10.
It is a block diagram showing an example of the configuration of the continuous output control circuit 24 that is installed inside (2).The input terminal of the continuous output control circuit 24 includes:
A vertical synchronizing signal V, a horizontal synchronizing signal H, and a clock signal φ having a frequency equal to the pixel frequency as shown in the sixth diagram are inputted through the input terminal shown in the first diagram and the rotary transformer 12. These six types of signals are separated by a signal separation circuit 51, and are respectively input to a 2-bit binary counter 52, one input terminal of two-man AND gates 57 to 60, and one input terminal of two-man AND gates 61 to 64. is combined with

When the rotating cylindrical body starts rotating 100 times and reaches the synchronous speed, and the line sensor 20 moves to the starting end of a predetermined imaging area, the first vertical synchronizing signal V is input to the 2-bit binary counter 5.
2 is input. The position of the line sensor 20 can be detected using an appropriate position detection sensor (not shown). As a result, among the AND gates 55 and 56, only the output of the AND gate 56 becomes "1". The subsequently generated horizontal synchronizing signal passes through the AND gate 57 and makes the parallel transfer switch 20B of the line sensor 20 conductive. As a result, the pixel signals accumulated in the magneto-optical converter 2OA are
The signals are transferred in parallel to a serial transfer unit 20C provided corresponding to each pixel. The next input clock signal φ is the AND gate 6
1 to the serial transfer unit 2DCI of the line sensor f20, from which the pixel signal of the line sensor 20 is clocked out. This time-series pixel signal is outputted to an output terminal 14 via a rotary transformer 12 and supplied to a television receiver.

The second vertical synchronization signal V is a 2-bit binary counter 5.
2, the output of the AND gate 54 instead of the AND gate 56 becomes "1". At this time, the line sensor 20 has reached the end of the imaging area rotated by 90 degrees from the reading start position, and the line sensor 21 is now located at the starting end of the imaging area.

Therefore, it is exactly the same as when the line sensor 20 (=
The image formed on the circumferential surface of the rotating cylindrical body 10 is scanned by the line sensor 21, and time-series pixel signals (=converted) are output to the output terminal 14.In the same manner, the line sensors 22 and 26 Each frame is scanned and read out. In other words, in this embodiment, while the rotating cylindrical body 10 rotates once (by two or four line sensors 2o to 23, a total of four frames are scanned and read out). In the case of interlaced scanning (=, line sensors 20 and 22 scan odd fields, and line sensors 21 and 23 scan even fields).

Although four line sensors were used in the above embodiment, in principle any number of line sensors greater than or equal to two can be used. As the number of line sensors used increases, the electric circuit becomes more expensive, but the burden on the optical lens system is reduced, making the lens system cheaper (second reason).

Further, in the above-described embodiment, a configuration in which the line sensor continuous control circuit is built into the rotating cylindrical body is exemplified, but it is clear that this part may be installed outside the rotating cylindrical body.

In addition, in the above embodiment, the case of broadcasting on TV was exemplified, but
The device of the invention can also be used as a transmitting device in a high speed copying transmission system.

As explained in detail above, the present invention arranges a plurality of line sensors on a cylindrical body that rotates in synchronization with a vertical synchronization signal, and uses an optical lens system to image a two-dimensional image on the rotating cylindrical surface. It forms an image and selectively reads out this image in synchronization with a horizontal synchronization signal.It does not require the use of expensive two-dimensional centimeters or complicated and expensive mechanical systems, making it simple and easy to use. This has the advantage that an inexpensive scanning photoelectric conversion device can be realized.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
FIG. 3 is a block diagram showing an example of the configuration of the line sensor and readout control circuit in the illustrated embodiment, and FIG. 3 is a waveform diagram for explaining the operation of the apparatus shown in FIGS. 1 and 2. 10... Rotating cylindrical body, 11... Electric motor, 12...
Rotary transformer, 13, 14... Person, output terminal, 20 to 23... Line sensor, 24... Successive control circuit, 30... Cylindrical lens, 33
...Light source, 40...Film.

Claims (1)

[Claims] A mechanism for obtaining image signals two-dimensionally by driving a line sensor, which detects optical information one-dimensionally and converts it into a time-series signal, in two directions: horizontally so that its locus forms the outer peripheral surface of a cylinder. and an imaging lens system including a cylindrical lens for forming a two-dimensional image on a part of the outer peripheral surface of the cylinder formed by the locus of the line senna.