KR20040033964A - Camera for focusing by moving photographing element - Google Patents

Abstract

PURPOSE: A camera is provided to perform focusing work without using an expensive lens box by achieving the focusing of the camera through moving a position of a charge coupled device. CONSTITUTION: A camera includes a lens(100) and a charge coupled device(221). In order to photograph a subject, a focusing is carried out by adjusting a distance between the lens(100) and the charge coupled device(221). A position of the charge coupled device(221) is shifted by means of a moving unit(210). A DSP(240) is provided in order to process a control signal for controlling the charge coupled device(221) and to control a system. The charge coupled device(221) is fixed to a substrate(220). The substrate(220) is connected to the DSP(240) through a flexible cable.

Description

Camera for focusing by moving the position of imager {Camera for focusing by moving photographing element}

The present invention relates to a camera, and more particularly, to a camera that performs focusing by moving a position of an image pickup device without manipulating a lens in an operation of focusing a subject.

The basic structure of the camera is a structure in which an object is imaged through an lens to an image pickup device (a digital camera mainly uses a CCD (Charge Coupled Device)). Shutters that allow light to pass through, and finders to know the shooting range are added. In addition, as a mechanism for facilitating shooting and preventing failure, an exposure meter and various automatic mechanisms are provided as necessary. In addition, in the case of a digital camera, a timing processor for outputting signals such as pulse signals and horizontal / vertical frequency exposure time is required so that the image pickup device can pick up an image.

In addition, the camera body may be manufactured in a required shape according to the type of camera, and a zoom lens may be provided to adjust the distance by providing a plurality of lenses in the lens unit to adjust the focal length.

In the case of a simple camera, a convex meniscus lens may be used, and in most cases, three or more lenses are used, and the overall shape is a convex lens. This is to meet the requirement that the image is formed over the required range, the lens is as bright as possible, the brightness of the center and periphery is uniform, and the image should not be skewed. Since a satisfactory result cannot be obtained with the lens, each lens is composed of a pair of optical lenses having different properties.

FIG. 1 is a block diagram briefly illustrating a form in which a focus is performed on a subject of a general camera, and FIG. 2 is a block diagram of an internal structure of a general camera.

Referring to FIG. 1, since the focal length is determined by the distance d between the surface of the image pickup device 22 and the lens of the lens box 10, the lens is zoomed by using a zoom lens in the lens box 10. And adjust the distance to the image pickup device surface.

Therefore, in order to actually photograph the subject, in order to adjust the focal length with the subject 1, the user manually manipulates the lens box 10 composed of a plurality of lenses so that the position of the lens moves in the range between dl. Adjust the distance (d) between the elements (CCD) 22, or adjust the distance between the lens and the image pickup device (CCD) 22 by allowing the motor built in the lens box 10 to be operated by a controller (not shown) By doing so, focusing is achieved.

When the image is focused and the image is formed on the image pickup device 22, the image of the image is transferred to the main system 30 to be used according to the user's purpose.

A camera having a motor built into the lens box 10 and focusing automatically includes a motor 11 in the lens box 10 itself, as shown in FIG. 2, and the motor 11 has a camera body. Receives a movement signal of the control unit (not shown) provided in the (20) through the A / D converter 22 is made of a structure to stop the lens at the position where the focus is best.

Hereinafter, an operation process of focusing, for example, an iris recognition camera to be mainly dealt with in the present invention will be described.

In the state where the lens position dl is divided into the maximum value (max) and the minimum value (min) in eight steps, the image is formed on the image pickup device 22 by driving the motor 11 to analyze the frequency characteristics of the resultant image. When the image is clearly formed, the position of the lens for the high frequency state is recognized, and the lens position for the most high frequency state is recognized again at each position by dividing it into 8 steps more closely back and forth from the perceived position according to the first result. If you want to capture more detail, the same operation is repeated a certain number of times.

In this way, when the information on the final position of the lens is obtained, shooting starts from that position.

In the case of the iris recognition camera, since the detailed organization of the iris must be shown, a process may be pre-programmed in the controller to perform the above operation several times.

However, the focusing method by adjusting the position of the lens in the lens box, as in the prior art, should have a motor for adjusting the position of the lens in the lens box, so the lens box itself is large in size and the subject (for example, an iris). Since there must be a lens standard suitable for taking a picture of the expensive lens box has to be variously provided.

In addition, when the lens standard suitable for the subject is not used, the depth of the subject becomes low, making the focusing work difficult, and the resulting images tend to become unclear.

Accordingly, the present invention has been made to solve the above problems, in the operation of adjusting the distance between the lens and the image pickup device to adjust the focus, by moving the position of the image pickup device itself without operating the lens to achieve a high price It is an object of the present invention to provide a camera made of focusing without having a lens box.

1 is a configuration diagram briefly illustrating a form in which focusing is performed on a subject of a general camera;

2 is a block diagram of an internal structure of a general camera;

3 is a configuration diagram briefly illustrating a form in which focusing is performed on a subject of a camera according to an embodiment of the present invention;

4 is a block diagram of a structure of a camera for focusing by moving the image pickup device according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: subject 100: lens

150: fastening portion 200: camera body

210: moving means 211, 211 ': support

212: Ball screw 213: Slider

214: guide rail 215: motor

220: substrate 221: image pickup device

230: flexible cable 240: DSP

300: main system

d: distance between the image pickup device and the lens

dc: image pickup device moving section

A camera in which focusing is performed by moving a position of an image pickup device according to the present invention for achieving the above object is a camera in which focusing is performed on a subject by adjusting a distance between the image pickup device and a lens. Moving means for moving the position of the; And a control unit for outputting a movement control signal for determining a photographing position to a moving unit of the image pickup device.

The imaging device uses a Charge Coupled Device (CCD) or an MOS type image sensor, and is characterized in that it is connected by a flexible cable between a substrate supporting the imaging device and a controller.

The control unit uses a semiconductor device capable of high-speed processing, and in particular, it is preferable to use a DSP (Digital Signal Processor), and to pre-install a representative image (eg, template) of a subject according to the type of system to be used. There is a characteristic.

The moving means includes a support fixed to the camera body; A ball screw and a guide rail installed in the support; A slider connected to the ball screw and the guide rail, the position of which is changed by the rotation of the ball screw along the guide rail, and the substrate supporting the image pickup device is fixed; And a motor which rotates according to the movement control signal output from the controller to operate the ball screw.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

3 is a configuration diagram briefly illustrating a form in which a focusing is performed on a subject of a camera according to an embodiment of the present invention, and FIG. 4 is a structure of a camera moving and focusing an image pickup device according to an embodiment of the present invention. Is a block diagram of.

3 and 4, the camera focusing by moving the image pickup device according to the present invention focuses by adjusting the distance d between the lens 100 and the image pickup device 221 to capture the subject 1. In order to adjust the focusing (focusing), the position of the image pickup device is changed through the moving unit 210 of the image pickup device 221, and a control signal for controlling the location of the image pickup device 221 and system-wide control are performed. DSP 240 having a high-speed processing capability for processing, and flexible cable to the substrate 220 and the DSP 240 so that the data transfer between the substrate 220 and the DSP 240 is fixed to the image pickup device is made. 222 is connected to the structure.

In this case, since the lens 100 does not need to use an expensive lens having a separate motor as in the related art, a general lens is used.

Since the focal length is determined by the distance d between the surface of the image pickup device 221 and the lens 100, the lens 100 may be moved by moving a printed circuit board (PCB) 220 to which the image pickup device 221 is fixed. 3), the moving range of the imaging device 221 is dc shown in FIG. 3, and the moving means 210 for moving the imaging device will be described in detail with reference to FIG.

Meanwhile, the camera body 200 provided with the lens 100 and the imaging device 221 is connected through a separate fastening part 150.

As shown in FIG. 4, the moving unit 210 fixes the substrate 220 on which the image pickup device 221 is fixed to the slider 213, and because the substrate 220 itself moves, the flexible cable 222 controls the DSP. And the slider 213 is installed on the ball screw 212 and the guide rail 214 to move linearly according to the rotation of the motor 215, and the guide rail 214 and the ball screw 212. Is connected to the support (211, 211 ') is fixed to the main body, the motor 215 is connected to the same axis as the ball screw 212, which is the axis of the support (211') from the DSP 240 to the substrate 220 is configured to receive a control signal for the moving distance.

In the present invention has been described by adopting the LM guide method as an embodiment of the moving means 210, in addition to the air cylinder method, rack pinion gear, such as a mechanism for performing a linear reciprocating motion can be selected and used.

Referring to the operation of the camera configured as described above using an example of the iris recognition system, since the subject 1 is the iris, the DSP 240 searches for a position where the subject 1 can be taken clearly. ) And scans the subject 1 in eight steps as in the prior art while moving the substrate 220 to the imaging device moving range (dc).

The position of the image pickup device recognized as the highest frequency among the scanned data is found, and the subject 1 is rescanned by dividing it into eight steps in detail.

When the image capturing device position where the sharpest image is obtained by repeating the above operation for a predetermined number of times is found, the image capturing device substrate 220 is stopped at the position to photograph the iris, that is, the subject 1.

If the subject 1 is an iris, the DSP 240 stores an image of the iris in advance, and quickly compares the image of the subject 1 to be photographed when the subject 1 is photographed, and not glasses or eyebrows. To prevent images such as

Although the preferred embodiments of the present invention have been described in detail above, those skilled in the art will appreciate that the present invention may be modified without departing from the spirit and scope of the invention as defined in the appended claims. It will be appreciated that modifications or variations may be made. Therefore, changes in the future embodiments of the present invention will not be able to escape the technology of the present invention.

As described above, according to the present invention, since the focusing is performed by shifting the position of the image pickup device itself, it is possible to reduce the cost by eliminating the need for using an expensive zoom lens including a motor and a plurality of lenses. The DSP has an advantage of speeding up the processing speed.

In addition, if the object of the subject is an iris, a lens suitable for iris photography may be designed and used, and thus an additional effect of deepening the depth of field may be achieved by inserting and using an optimal lens in the camera.

Claims (8)

In a camera that focuses on a subject by adjusting a distance between an image pickup device and a lens, Moving means for moving the position of the image pickup device within the camera body to focus; And And a control unit for outputting a movement control signal for determining a photographing position to a moving unit of the image pickup device. The camera of claim 1, wherein the imaging device uses a charge coupled device (CCD). The camera according to claim 1, wherein the image pickup device uses a metal oxide semiconductor MOS (Image Oxide Semiconductor) type image sensor. The method of claim 1, wherein the control unit A camera that performs focusing by shifting the position of an image pickup device, characterized by using a semiconductor device capable of high speed processing. The method of claim 1 or 4, wherein the control unit A camera that performs focusing by moving a position of an image pickup device, characterized by using a DSP (Digital Signal Processor). The method of claim 1 or 4, wherein the control unit A camera in which focusing is performed by moving a position of an image pickup device, wherein a representative image (eg, a template) of a subject is pre-built according to the type of system to be used. The method of claim 1, wherein the image pickup device Camera focusing is performed by moving the position of the image pickup device, characterized in that the flexible cable is connected between the substrate (PCB) for supporting the image pickup device and the control unit. The method of claim 1, wherein the means for moving Supports 211 and 211 'fixed to the camera body; Ball screws 212 and guide rails 214 installed in the supports 211 and 211 '; A slider 213 connected to the ball screw 212 and the guide rail 214, the position of which is changed by rotation of the ball screw along the guide rail 214, and the substrate 220 supporting the image pickup device is fixed; And Camera having a focus by moving the position of the image pickup device, characterized in that consisting of a motor (215) for rotating the ball screw 212 in accordance with the movement control signal output from the control unit.