KR20090072503A - Camera system and method for controlling thereof - Google Patents

Abstract

A camera system and a control method thereof are provided to be possible for close-up photographing without a separate lens or tool by drawing out a lens unit from a camera main body. A camera system comprises: a camera body(100); and a mount unit(300) drawn out or led into the camera body. The main body comprises a motor generating the driving force and a screw(160). The screw connects to the motor to rotate along with the motor. The screw thread is formed at the outer circumference of the screw. A guide unit(310) is formed at the inner circumference of a mount. The guide unit has the other screw thread corresponding to the screw thread of the screw. The mount unit is drawn from the camera body in the close-up photographic mode of the camera system. One side of the mount unit is formed in order to be combined to a lens module.

Description

Camera system and method for controlling thereof

The present invention relates to a camera system and a method of controlling the same, and more particularly, to a camera system and a method of controlling the same, capable of taking close-up photography without a separate lens or mechanism.

In recent years, digital single lens reflex (DSLR) cameras capable of taking professional photographs have been widely used. A digital single-lens reflex camera is a single-lens reflex camera that takes digital pictures.

Here, the single-lens reflex type means to send an object to the viewfinder through a single lens or to send a light to a sensor for taking a picture. Commonly used entry-level digital camera is the dual lens. Therefore, the entry-level digital camera is different from what is seen, so that the image transmitted to the sensor can be taken while viewing through the screen.

Recently, users who take macro photographs of flowers or insects by using such digital single-lens reflex cameras are increasing. Close-up means taking a large photograph of a subject by approaching the camera within the lens's short range, also called close-up photography. In general, it is a case of shooting closer to the shortest shooting distance of the camera by using a close-up accessory.However, in a single-lens reflex camera, it is often possible to close the camera to some extent. The macro shooting conditions are shorter than 10 times the focal length of the lens.

For such close-up photography, it was common to use a close-up photography lens or macro ring.

First, the lens used for affixing includes a macro macro lens and an auxiliary lens, which is an iron meniscus, attached to the front of the lens. . This auxiliary lens is also called an attachment or a close-up lens. There is also an auto-up in which an auxiliary lens is paired with a correction lens of a rangefinder as an interlock.

Next, in the single-lens reflex camera that can replace the lens can be used a macro ring mounted in the middle of the lens and the body, the length of the ring is selected according to the macro distance to shoot. In some cases, a bellows device may be used instead of the ring between the lens and the body.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the main body, a macro ring, and a lens part of a digital single-lens reflex camera.

Referring to FIG. 1, in the conventional digital single-lens reflex camera, the lens unit 20 is separated from the mount unit 30 formed on one side of the camera body 10 in order to take macro shots, and then the mount unit 30 is mounted. Is attached to a separate macro ring 40, and the lens unit 20 is mounted on the front surface of the macro ring 40.

If you want to take a close-up shot using a conventional digital single-lens reflex camera as described above, replace the lens with a separate macro lens, or remove the lens unit from the camera body, attach a separate macro ring, and then combine the lens again Since this was used, there was a problem that macro photography was cumbersome. In addition, because a separate lens or an affix ring or the like is required, a user has a cost burden, and there is also a problem that storage and transportation of the camera are not easy due to a separate component.

An object of the present invention is to provide a camera system capable of macro photography without a separate lens or mechanism and a control method thereof.

The present invention camera body; And it provides a camera system including a mount portion that is drawn in and / or with respect to the camera body.

In the present invention, the mount unit may be drawn to the camera body in the macro shooting mode of the camera system.

In the present invention, one side of the mount portion may be formed to be coupled to the lens module.

In the present invention, the main body includes a motor that generates a driving force and a screw which rotates together with the motor and has a screw thread formed on an outer circumferential surface thereof, wherein the mount portion corresponds to the thread of the screw on an inner circumferential surface thereof. It may include a guide portion formed with a thread of the shape to be.

In the present invention, when the motor and the screw coupled to the motor rotates, the mount portion may be pulled in and / or drawn out with respect to the camera body along the screw.

In the present invention, the main body includes a hydraulic cylinder, by which the mount portion can be drawn in and / or withdrawn from the camera body.

According to another aspect of the present invention, there is provided a method of controlling a camera system in which macro photography is possible, the method comprising: setting a macro shooting mode; And it provides a control method of the camera system comprising the step of extracting the mount from the camera body.

According to the present invention as described above, it is possible to obtain the effect that macro photography can be performed without a separate lens or mechanism.

2 is a view showing the front appearance of the camera system according to the present invention.

2, a shutter-release button 111, a mode dial 113, and a lens unit 200 are provided in front of the camera body 100.

The shutter release button 111 of the camera body 100 opens and closes to expose an image capturing element (eg, CCD or COMS) to light for a predetermined time, and adjusts the subject in conjunction with an aperture (not shown). The image is recorded on the image capturing device.

The shutter-release button 111 generates first and second image capturing signals by a photographer input. When the first image capturing signal as the half shutter signal is input, the camera main body 100 focuses and adjusts the amount of light. When focus is achieved by the input of the first image capturing signal and the amount of light is adjusted, the second image capturing signal as a complete shutter signal is input to capture an image.

The mode dial 113 is input for the shooting mode selection. In the camera main body 100, the mode dial 113 has an optimal camera according to the AUTO (auto shooting) mode, a shooting situation or a subject state, which is used for minimizing user settings and for recording images quickly and easily according to the purpose of use. A / S / used to capture video by manually setting various functions, including the SCENE mode, the EFFECT mode, which is used to give special effects to the video shooting, such as continuous shooting, and the aperture and shutter speed. It supports M mode and the like, and is not limited to the above modes.

The lens unit 200 receives light from an external light source and processes an image.

3 is a view showing the rear appearance of the camera system according to the present invention.

Referring to FIG. 3, a rear view camera 133, a wide angle zoom button 119w, a telephoto zoom button 119t, and a function button 121 are located behind the camera body 100. ) And a display unit 123.

In the camera body 100, the view finder 133 is a small window for viewing and setting a composition of a subject to be photographed.

The wide-zoom button 119w or the tele-zoom button 119t may have a wider angle of view or a narrower angle of view depending on an input. In particular, the wide-zoom button 119w or telephoto-zoom button 119t may be input when the size of the selected exposure area is changed. When the wide-zoom button 119w is input, the size of the selected exposure area is reduced, and when the tele-zoom button 119t is input, the size of the selected exposure area is increased.

The function button 121 includes a total of five buttons including an up button, a down button, a left button, a right button and a menu / OK button. The function button 121 is input to execute various menus related to the operation of the camera main body 100. Each of the keys may be used as a shortcut key, and the function button 121 may be different according to each manufacturer.

4 is a view schematically showing a cross section of a camera system according to the present invention.

Referring to FIG. 4, the camera system according to the present invention includes a camera body 100, a lens unit 200, and a mount unit 300.

The lens unit 200 includes a plurality of lenses 221, and an aperture 222 is disposed between the plurality of lenses 221. The lenses 221 of the lens unit 200 are driven and controlled by the lens driving circuit, and the aperture 222 is driven and controlled by the aperture driving circuit.

The lens unit 200 is formed to be coupled to the mount unit 300 protruding from the front surface of the camera body 100. A coupling relationship between the camera body 100, the lens unit 200, and the mount unit 300 will be described in detail later.

On the optical axis of the lenses 221, behind the lenses 221, a mirror 124 is formed, with the central portion consisting of a half mirror. The mirror 124 is formed to be rotatable within a predetermined angle about an axis.

Sub mirrors (not shown) are formed on the rear surface of the mirror 124. A portion of the light incident on the lens unit 200 passes through the mirror 124 and is reflected by the submirror. A separator optical system for separating two phases is disposed on the reflected light axis of the submirror. The AF sensor is disposed at an image forming position on the subject by the separator optical system. The AF sensor is connected to the AF sensor driving circuit.

The submirror, the separator optical system, and the AF sensor constitute a focus detection apparatus using a known phase difference method. The AF sensor is driven and controlled by the AF sensor driving circuit under the control of the CPU. That is, the CPU calculates the defocus amount based on the image signal generated by the AF sensor, and controls the lens driving circuit using the same to drive and focus the lenses 221 of the lens unit 200. Here, the lens driving circuit includes a drive source such as an electronic motor or an ultrasonic motor, a driver circuit for controlling the same, an encoder device for detecting the position of the lens, and the like.

The focus plate 131, the pentaprism 132, and the view finder 133 are disposed on the path of the light reflected by the mirror 124. The subject light obtained by the lenses 221 of the lens unit 200 is reflected by the mirror 124 and formed by the focus plate 131. The photographer may check an image of a subject formed on the focus plate 131 using the pentaprism 132 and the view finder 133.

The mirror 124 and the sub-mirror are formed to rotate in a predetermined range about the axis of the mirror 124 by the mirror driving circuit, so that the image on the optical axis of the lenses 221 of the lens unit 200. Can be retracted from. A shutter 126 and an imaging device 127 are disposed behind the mirror 124 on the optical axis of the lens unit 200.

The shutter 126 is opened for a predetermined time by the drive control of the shutter driving circuit, and the image of the subject is picked up by the imaging device 127. That is, when the mirror 124 is raised to retract from the optical axis of the lens unit 200 by the drive control of the mirror drive circuit, and the shutter 126 is opened by the drive control of the shutter drive circuit, the imaging device 127 is formed on the subject.

The lens driving circuit, the aperture driving circuit, the mirror driving circuit, the AF sensor driving circuit and the shutter driving circuit are connected to a CPU constituted of a microprocessor via a data bus.

In addition, the switch input means and the EEPROM, which is a nonvolatile memory, are also connected to a CPU constituted of a microprocessor via a data bus.

The switch input means includes a first release switch and a shutter release button (on), which are turned on by a first image capture signal as a half shutter signal of the shutter release button (see 111 in FIG. 1) of the camera body 100. A second release switch which is turned on by the second video photographing signal as a complete shutter signal (refer to 111 of 1), and a plurality of switches such as a power switch linked to a power button (not shown). The operation signal by any one switch operation of the switch input means is supplied to the CPU.

The CPU controls driving of the AF sensor driving circuit when the first release switch is ON, calculates a distance between two phases on the AF sensor, and controls driving of the lens driving circuit from the distance data, thereby driving the lens unit 200. Focusing of the lenses 221 is performed.

The CPU controls driving of the mirror driving circuit when the second release switch is turned on, driving the mirror 124 to retract from the optical axis, and appropriately based on the subject luminance information based on the output of the AF sensor. Obtain the section shrinkage value and the shutter exposure time. The aperture driving circuit is driven and controlled using the contraction value to drive the aperture 222, and the shutter driving circuit is controlled using the shutter exposure time to drive the shutter 126.

If the image of the subject is imaged on the image pickup surface of the image pickup device 127 by such an operation, the image of the subject is converted into an analog image signal, which is converted into a digital image signal in a signal processing circuit.

The signal processing circuit is connected to EPROM, SDRAM and flash memory using a data bus.

The EPROM stores programs executed by a processor included in the signal processing circuit. Synchronous dynamic random-access memory (SDRAM) is a memory that temporarily stores image data before image processing and image data during image processing. The flash memory is a nonvolatile memory that stores finally determined image data. SDRAM is a volatile temporary storage means that high-speed operation is possible, but the memory contents are lost when the power supply is cut off, while flash memory is a non-volatile memory means, and it operates at low speed, but the memory contents are preserved even when the power supply is cut off. .

Hereinafter, the coupling relationship between the camera body 100, the lens unit 200, and the mount unit 300 will be described in detail.

In a single-lens reflex camera, the lens can be mounted on or detached from the body. The single-lens reflex camera mainly uses the bayonet type. In the bayonet type, the lens unit 200 is attached to the camera body 100 by inserting and turning the lens unit 200 to the mount unit 300 attached to the camera body 100.

Here, one or more motors (not shown) are disposed on the front portion of the camera body 100 in which the mount unit 300 is disposed. The motor 160 is coupled with a screw 160 having a predetermined thread formed on its outer circumferential surface. In addition, the mount part 300 is provided with a guide part 310 capable of accommodating the screw 160. In addition, the inner peripheral surface of the guide portion 310 is formed with a thread of the shape that is engaged with the screw thread formed in the screw 160. Here, the screw 160 may be a ball screw (BALL SCREW) or TM screw (TM SCREW). The guide unit 310 may be an LM guide. By such a configuration, the rotational motion of the motor is switched to the linear motion of the mount, so that the mount can be pulled out and / or drawn out from the camera body.

FIG. 4 is a view illustrating a mount part being drawn in the camera body in the camera system, and FIG. 5 is a view illustrating a mount part being drawn out from the camera body in the camera system of FIG. 4.

In the general shooting mode as shown in FIG. 4, when the photographer selects the macro shooting mode for macro shooting, the motor 160 is driven and the screw 160 coupled with the motor rotates. Then, as the screw 160 rotates, the guide part 310 of the mount part 300 is advanced, and thus, the mount part 300 and the lens part 200 coupled to the mount part 300 are advanced as a whole. As shown in FIG. 5, the camera body 100 is withdrawn as much as 'd'. Therefore, the focal length between the lens unit 200 and the imaging device 127 is farther away, so that the focus can be focused at a shorter distance than the inherent focal length of the lens itself, thereby making macro photography possible.

In addition, in the macro shooting mode as shown in FIG. 5, when the photographer selects the normal shooting mode for normal shooting, the motor is driven in the reverse direction to rotate the screw 160 coupled to the motor in the reverse direction. Then, as the screw 160 rotates, the guide part 310 of the mount part 300 is retracted, so that the mount part 300 and the lens part 200 coupled to the mount part 300 are retracted as a whole. As shown in FIG. 4, the camera is inserted into the camera body 100, and general shooting is possible.

In the drawings, the mount unit 300 is illustrated as using a screw and a guide to draw in and out with respect to the camera body 100, but the scope of the present invention is not limited thereto. That is, the mount unit 300 is connected to the camera body. A structure capable of drawing in and drawing out 100, for example, a hydraulic cylinder, a cam, etc., all belong to the idea of the present invention.

According to the present invention as described above, it is possible to obtain the effect that macro photography can be performed without a separate lens or mechanism.

Next, the control method of the camera system will be described in detail with reference to FIG. 6.

Referring to FIG. 6, in the control method of the camera system according to the present invention, determining whether the macro shooting mode is selected (step S110), and when the macro shooting mode is selected, the motor is turned on ( ON) (step S120), rotating the motor (step S130), extracting the mount unit from the camera body (step S140), inputting a shutter release signal (step S150), and generating an image file. And storing (step S160).

In detail, setting of the macro shooting mode (step S110) may be selected by the user by operating the mode dial 113 or the function button 121. Alternatively, when the subject approaches within a certain distance, the CPU of the camera system may automatically determine the macro shooting mode and set the macro shooting mode.

When the macro shooting mode is set as described above, the power of the motor is turned on (step S120), the motor rotates (step S130), and the mount unit is taken out from the camera body (step S140). That is, when the motor 160 is driven and the screw 160 coupled with the motor rotates, the screw 160 rotates to advance the guide part 310 of the mount part 300, and thus the mount part 300 and the mount part ( The lens unit 200 coupled to 300 is advanced overall and drawn out from the camera body 100. Therefore, the focal length between the lens unit 200 and the imaging device 127 is farther away, so that the focus can be focused at a shorter distance than the inherent focal length of the lens itself, thereby making macro photography possible.

Finally, when the shutter release signal is input (step S150), the captured image is generated as a JPEG image file, displayed on the display unit 123, and stored in the storage unit (step S160).

According to the present invention as described above, it is possible to obtain the effect that macro photography can be performed without a separate lens or mechanism.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the main body, a macro ring, and a lens part of a digital single-lens reflex camera.

2 is a view showing the front appearance of the camera system according to the present invention.

3 is a view showing the rear appearance of the camera system according to the present invention.

4 is a view schematically showing a cross section of a camera system according to the present invention.

FIG. 5 is a view illustrating a mount part being drawn out from the camera body in the camera system of FIG. 4.

6 is a flowchart illustrating a control method of a camera system according to the present invention.

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

100: camera body 200: lens unit

300: mount unit

Claims (7)

Camera body; And A camera unit including a mount unit which is inserted into and / or drawn out from the camera body. The method of claim 1, And the mount unit is withdrawn to the camera body in the macro shooting mode of the camera system. The method of claim 1, One side of the mount unit is a camera system, characterized in that the lens module is formed to be coupled. The method of claim 1, The main body includes a motor generating a driving force and a screw which is coupled to the motor to rotate together with the motor and has a thread formed on an outer circumferential surface thereof. The mount unit includes a guide unit is formed on the inner circumferential surface is formed with a thread of a shape corresponding to the thread of the screw. The method of claim 4, wherein And when the motor and the screw coupled to the motor rotate, the mount portion is drawn in and / or drawn out with respect to the camera body along the screw. The method of claim 1, The main body includes a hydraulic cylinder, wherein the mount portion is drawn and / or withdrawn from the camera body by the hydraulic cylinder. In the control method of the camera system capable of macro photography, Setting a macro shooting mode; And The method of controlling the camera system comprising the step of extracting the mount from the camera body.

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