JPH07283998A - Wide angle line of sight photographing device - Google Patents

Abstract

PURPOSE:To provide a wide angle line of sight photographing device of small size and with high responsiveness by providing at least one optical lens to converge light and controlling a solid-state image pickup element to generate an electric charge by the light and the posture of the light receiving plane of it. CONSTITUTION:This device is constituted in such a way that the solid-state image pickup element 2 is integrated with an actuator, and the light converged on at least one fixed lens 1 can be sent out as an image formed on an individual lens 1 as controlling by driving the actuator. The solid-state image pickup element 2 is of 10mm at the most and is formed in small size and light weight. An image with wide line of sight can be obtained at high speed without moving an optical system including the lens 1 by following the light converged on a wide angle lens or at least one lens by driving the solid-state image pickup element by the actuator. In such a way, since only the solid-state image pickup element is driven. a device operated at high speed and with high responsiveness can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera device, and more particularly to a camera device and a recording device capable of photographing a wide-angle field of view at high speed.

[0002]

2. Description of the Related Art Surveillance camera devices currently on the market are
It is composed of a camera unit composed of a lens and a solid-state image sensor and a movable table for driving the camera unit, and is configured to be able to follow the movement periodically or according to an object to be photographed. Such a technique is described in JP-A-4-159892.

[0003]

In the conventional technique, the weight of the lens, the housing for holding the lens, the image pickup device, and the moving base becomes large, and it becomes difficult to drive at high speed. Further, since a gear train for transmitting the motor driving force is required, there is a time delay such as backlash and it is difficult to control the drive at high speed.

In order to increase the driving speed, it is necessary to use a motor having a large torque, which increases the price and the size of the entire device.

An object of the present invention is to realize a compact camera device capable of high-speed response.

[0006]

[Means for Solving the Problems] In order to solve the above problems,
This is achieved by a configuration in which the solid-state image pickup device is integrated with an actuator, and the light converged from at least one or more fixed lenses is sent out to form an image formed by each lens while driving and controlling the actuator.

[0007]

The solid-state image pickup device is at most about 10 mm square and is small and lightweight. By driving this element with an actuator, a wide-angle lens can be obtained, or by following light converged by one or more lenses, an image with a wide field of view can be obtained at high speed without moving the optical system including the lens. .

[0008]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a conceptual diagram of the present invention, and the basic operation will be described. Reference numeral 1 is a convex lens, 2 is a solid-state image sensor, and 3 is a pulse motor. The detailed structure will be described with reference to FIG. Three lenses having one focus (at least one lens and three lenses are shown in FIG. 1) are arranged in an arc shape and rotatable about the center (meaning the center of the lens or the arc of the arc passing through the focus). A solid-state image sensor is arranged on this axis. Geometrically, it is a method of driving so that the solid-state imaging device is arranged at the image forming position by the A, B, and C lenses. In FIG. 1, the image formed by each lens can be detected by rotating it by θ.

FIG. 2 is a block diagram of the present invention.

The control means controls the moving amount and moving time of the driving means including an actuator such as a motor and a piezoelectric element. The posture and the position of the solid-state image pickup device can be changed by the driving means. Here, the solid-state image sensor is generally CC
It is a charge-coupled device such as D, MOS or the like, and after receiving light, the stored signals can be sequentially read out to be combined as an image. The image processing means outputs the read signal to T
It is characterized by synthesizing as a V image (1 field 60 Hz) and detecting movement of the reproduced image signal. Regarding the motion detection, there is a method of comparing and detecting a change in the luminance signal of a predetermined pixel before and after one field, but the description thereof is omitted because it is a known technique (for example, a field memory is mounted in this image processing unit, and a fixed time is required). There is a method to detect the difference between before and after).

Next, the operation algorithm shown in FIG. 2 will be described in detail. It is assumed that the image at the position A is being detected.

The signal sent from the solid-state image pickup device is input to the image processing means. The image processing means detects whether or not there is a movement in the signal sent from the solid-state imaging device, and if there is no movement within a certain time, the control means moves the solid-state imaging element to the B position.

In this way, the solid-state image pickup device is moved in sequence while detecting the movement within a fixed time, and recording is performed on the recording / reproducing apparatus.

When the moving body is detected, a detection signal is sent to the control means, and the control means realizes the method of controlling the driving means so that the solid-state image pickup device follows the moving body. The image signal obtained by the image processing means is recorded and reproduced by a predetermined number of tracks by the control means. The recording method will be described with reference to FIG.

FIG. 3 is a flowchart of the above operation. When initialized with A shown in FIG.
Transfer and record the image data of. The number of pulses that gives the rotation angle θ is given to the pulse motor and fixed at B, and the image data is transferred and recorded.

After shooting A → B → C, the reverse is C → B →
The image is taken with A, and the relative position of the lens and the image pickup device is secured with high accuracy at A. This is to correct the deviation of the optical axis caused by the backlash of the drive system. (This initialization method will be described with reference to FIG. 5) FIG. 4 illustrates the relationship between the number of pulses applied to the pulse motor and the motor shaft rotation angle. The rotation angle θ linearly corresponds to the number of pulses N.

Therefore, the motor rotation angle can be driven with high precision by controlling the number of pulses.

FIG. 5 illustrates the drive mechanism.

First, the part names and configurations will be described.

Reference numeral 4 is a holding plate, 5 is a piezoelectric element, 6 is a rotating shaft of a pulse motor, 7 is a rotating member, 8 is a voltage applying line, 9 is a magnet, 10 is a magnetoresistive head, and 11 is a signal line.

The solid-state image pickup element is fixed to the holding plate 4 and fixed to one end surface of the piezoelectric element 5.

A rotary member 7 is attached to the rotary shaft 6 of the pulse motor 3.
Is fixed and rotatable integrally.

One end surface of the piezoelectric element 5 is fixed to the rotating member 7. Therefore, when the voltage V is applied to this piezoelectric element,
By N / OFF, it is possible to expand and contract in the direction of arrow δ in the figure with an accuracy of the order of 1 μm. This piezoelectric element is a laminated type and can be achieved by applying a voltage to the end of each layer.

A magnet 9 is arranged at one end of the outer periphery of the rotary member 7, and the magnetic force line emitted from the magnet 9 is detected by the magnetoresistive head 10.

The operation of the present invention will be described with the above configuration.

It is now assumed that the state is A shown in FIG. When the control means shown in FIG. 2 applies a predetermined pulse to the pulse motor 3, the solid-state imaging device 2 connected to the rotating member 7 rotates and is fixed at the position B shown in FIG. Similarly, when a further pulse is applied, the position moves to the position C. When a reverse voltage pulse is applied to the pulse motor 3 at the position C, the position returns to the positions B and A again. At this time, the output of the magnet 9 arranged on the rotating member 7 resets or initializes at the position A, and corrects the angular error caused by the rotation accuracy of the pulse motor, the axial loss due to temperature, and the like.

In this embodiment, the detection method using one magnet for the initial positioning has been described. However, a configuration in which a plurality of magnets are arranged may be used, and a detection method using light may be used instead of detection using magnetism.

FIG. 6 is a diagram for explaining an example of the above-mentioned operation on the time axis.

From ₀ to t ₀ , the A image is recorded at the A position, between t ₁ and t ₂ , the B image is recorded at the B position, and from t ₃ to t ₃ .
During t ₄ , the C image is recorded at the C position.

The control means shown in FIG. 2 corresponds to such an operation.

FIG. 7 shows a tape pattern in the recording / reproducing apparatus shown in FIG.

The image of A and the image of B are separately recorded on several tracks. In a home VTR, the time for one field is 1/60 seconds and one track is one field, but when recording a high-definition image, it may be divided into a plurality of lines.

In this embodiment, the example of driving in the one-axis direction has been described, but it is also applicable to multi-axis driving of two or more axes.

[0035]

As described above, according to the present invention, since only the solid-state image pickup device is driven, it is possible to provide a high-speed and responsive surveillance camera device.

[Brief description of drawings]

FIG. 1 is a mechanism diagram of the present invention.

FIG. 2 is an operation block diagram of the present invention.

FIG. 3 is a diagram showing an operation algorithm of the present invention.

FIG. 4 is a rotation angle diagram of an applied pulse and a pulse motor.

FIG. 5 is a diagram showing an image pickup element driving mechanism.

FIG. 6 is a diagram showing time axis control of a rotation angle of an image sensor.

FIG. 7 is a tape pattern diagram of the recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lens, 2 ... Solid-state image sensor, 3 ... Pulse motor, 4 ... Holding plate, 5 ... Piezoelectric element, 6 ... Pulse motor, 7 ... Rotating member, 8 ... Voltage application line, 9 ... Magnet, 10 ... Magnetoresistive head , 11 ... Signal lines.

Claims (3)

[Claims] 1. At least one optical lens for converging light.
A wide-angle visual field photographing apparatus having a plurality of solid-state imaging devices that generate charges by light, a driving unit that makes the posture of a light-receiving surface of the solid-state imaging device variable, and a control unit that controls the posture. . 2. The wide-angle visual field photographing apparatus according to claim 1, wherein the driving means for varying the posture of the solid-state image pickup element is controlled so as to change the posture at constant time intervals. . 3. A wide-angle visual field photographing apparatus according to claim 1, wherein the driving means is controlled so as to follow the image by the image data of the solid-state image pickup element.