JP6780232B2 - Electronic devices and control methods for electronic devices - Google Patents

Description

The present invention relates to an electronic device and a method for controlling the electronic device.

In general, a device having a lens and moving the lens to adjust focus and zoom is known to have a function of moving the lens by operating a button or the like. For example, Patent Document 1 discloses a projector including a lens driving device for moving a lens. The lens drive device disclosed in Patent Document 1 has a configuration in which the lens moves in the optical axis direction when the drive motor rotates, and the drive motor is rotated to move the lens in response to an operation of pressing a button. If the button is pressed for less than a certain period of time, a "short press" operation is performed, if the button is pressed for a certain period of time or longer, a "long press" operation is performed, and if a "short press" operation is performed and a "long press" is performed. The amount of movement of the lens differs depending on whether it is operated, and rough adjustment and fine adjustment are possible.

Japanese Unexamined Patent Publication No. 2006-106581

When the lens is moved in response to an operation on a button or the like as in the conventional configuration, the lens position desired by the operating user cannot be known during the operation. For this reason, Patent Document 1 has a configuration in which the amount of movement of the lens differs depending on whether the "short press" operation is performed or the "long press" operation is performed. However, as described in Patent Document 1, when the amount of movement of the lens corresponding to the operation is determined, it is necessary to repeatedly move the determined amount of the lens until the lens position desired by the user is reached. There was a problem that it took time.
The present invention has been made in view of the above problems, and is an electronic device and an electronic device having a function of operating a motor to move a lens according to an operation and capable of quickly adjusting a lens position. The purpose is to provide a control method for.

In order to achieve the above object, the electronic device of the present invention has an optical unit capable of moving the lens in the optical axis direction by the operation of a motor, a reception unit that receives an instruction for adjusting the lens position, and an instruction received by the reception unit. When the duration of the instruction received by the reception unit is less than or equal to the set period, the optical adjustment unit includes an optical adjustment unit that operates the motor to adjust the lens position of the optical unit. When the first adjustment operation for driving the motor is performed by a fixed amount and the duration of the instruction received by the reception unit is longer than the set period, the motor is based on a target value corresponding to the upper or lower limit of the operating range of the motor. It is characterized in that a second adjustment operation for driving the lens is performed.
According to the present invention, when the instruction for adjusting the lens position continues for a longer period than the set period, the motor is moved based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor to adjust the lens position. As a result, the motor can be greatly operated in response to the instruction, and the lens position can be quickly adjusted.

Further, the present invention is characterized in that, in the electronic device, the optical adjusting unit stops the motor when the instruction received by the receiving unit is completed after starting the second adjusting operation.
According to the present invention, when the instruction is completed while moving the motor based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor, the motor is stopped. Therefore, by adjusting the timing at which the instruction ends, the motor can be stopped at an appropriate position, and the lens position can be quickly adjusted.

Further, in the electronic device of the present invention, when the instruction received by the reception unit is completed after the optical adjustment unit starts the second adjustment operation, the operating amount of the motor reaches the target value. It is characterized in that the motor is stopped without it.
According to the present invention, when the instruction is completed while moving the motor based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor, the motor is stopped. Therefore, the adjustment can be started based on the target value for greatly operating the motor, and the motor can be stopped in response to the end of the instruction. Therefore, the motor can be greatly moved by a single instruction, and the motor can be stopped at this operating position, so that restrictions on the operation of the motor can be relaxed. As a result, the lens position can be adjusted quickly.

Further, in the electronic device of the present invention, the optical adjustment unit makes the second adjustment when the duration of the instruction exceeds the set period even before the instruction received by the reception unit ends. It is characterized by starting the operation.
According to the present invention, the lens position is quickly adjusted by moving the motor based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor even before the instruction for adjusting the lens position is completed. Can be done.

Further, according to the present invention, in the electronic device, the optical adjusting unit sets a target value for the operation of the motor, drives the motor based on the set target value, and executes the first adjusting operation. When the target value corresponding to the predetermined amount is set for each instruction received by the reception unit and the second adjustment operation is executed, the target value corresponding to the upper limit or the lower limit of the operating range of the motor is set. It is characterized by.
According to the present invention, the target value of the operation of the corresponding motor is set depending on whether the instruction for adjusting the lens position is less than or equal to the set period or exceeds the set period, so that the motor can be controlled based on the target value. .. When setting a target value corresponding to the upper limit or the lower limit of the operating range of the motor, the lens can be greatly moved in response to one instruction by setting the target value that can be regarded as the maximum. As a result, the lens position can be adjusted quickly.

Further, in the electronic device of the present invention, the optical adjusting unit drives the motor according to an operation pattern including an acceleration operation for accelerating the motor and a deceleration operation for decelerating the motor, and the first adjustment operation. Then, the motor is made to execute an operation including the deceleration operation according to the operation pattern matching the set target value, and in the second adjustment operation, after the instruction received by the reception unit is completed, the motor It is characterized in that the deceleration operation is executed.
According to the present invention, even when the motor is moved by setting a target value corresponding to the upper limit or the lower limit of the operating range of the motor, the deceleration operation can be performed and the motor can be stopped appropriately.

Further, according to the present invention, in the electronic device, the motor is composed of a stepping motor, and the optical adjustment unit is a control unit that sets the target value and the stepping motor based on the target value set by the control unit. It is characterized by including a drive unit that outputs a drive signal.
According to the present invention, the stepping motor can be operated efficiently and the lens position can be adjusted quickly.

Further, in the electronic device of the present invention, the reception unit is configured to be able to detect an operation on the operator, and when the operation of the operator is started, the start of the instruction is detected and the operation of the operator is performed. Is released, the end of the instruction is detected.
According to the present invention, the first adjustment operation and the second adjustment operation can be executed depending on whether or not the operation time of the operator is equal to or less than the set time, and the lens position can be quickly adjusted.

Further, according to the present invention, in the electronic device, the reception unit detects the instruction when an instruction signal is input from an external device, and the instruction signal is continuously transmitted from the external device or every predetermined time. It is characterized in that it is determined that the instruction is continued while the input is performed in the cycle of, and the end of the instruction is detected when the input of the instruction signal is interrupted for more than the predetermined time.
According to the present invention, the motor can be operated based on an instruction signal input from the outside to quickly adjust the lens position.

Further, the present invention is configured as an image pickup device including an image pickup element that receives light transmitted through the optical unit in the electronic device, and an image formation in the image pickup element is performed by adjusting the lens position by the optical adjustment unit. It is characterized by adjusting the state.
According to the present invention, the lens position of the image pickup lens in the image pickup apparatus can be quickly adjusted, and for example, focus adjustment and zoom adjustment can be quickly performed.

In order to achieve the above object, the control method of the electronic device of the present invention includes an optical unit capable of moving the lens in the optical axis direction by the operation of a motor, and a reception unit for receiving an instruction for adjusting the lens position. When the device is controlled and the motor is operated to adjust the lens position of the optical unit in response to the instruction received by the reception unit, and the duration of the instruction received by the reception unit is less than or equal to the set period, a predetermined amount When the first adjustment operation for driving the motor is performed and the duration of the instruction received by the reception unit is longer than the set period, the motor is moved based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor. It is characterized in that a second adjustment operation for driving is performed.
According to the present invention, when the instruction for adjusting the lens position continues for a longer period than the set period, the motor is moved based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor to adjust the lens position. As a result, the motor can be greatly operated in response to the instruction, and the lens position can be quickly adjusted.

Explanatory drawing which shows the schematic structure of a projection system. Functional block diagram of a projector and a document camera. Top view of the main part of the operation panel. The figure which shows an example of the operating range of a motor. Explanatory drawing which shows the operation example of a motor. A flowchart showing the operation of a document camera. A flowchart showing the operation of a document camera.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing a schematic configuration of a projection system 100 as an embodiment to which the present invention is applied.
The projection system 100 includes a projector 10 and four image input devices connected to the projector 10. In the present embodiment, as the image input device, a document camera 50, a personal computer 201, a video tape recorder (VTR) 202, and a DVD (Digital Versatile Disk) player 203 will be described. These image input devices provide an image input source for the projector 10. The image input device is not particularly limited as long as it is a device that supplies an analog image signal or digital image data to the projector 10. In addition to the above-mentioned devices, a TV tuner device, a CATV (Cable television) set-top box, a video game device, or the like may be used. Further, the image input by the image input device to the projector 10 may be a still image or a moving image (video). In the following description, an example in which the image input device included in the projection system 100 inputs digital image data to the projector 10 will be described.

The projector 10 selects one of the image input devices as an input source as described later, and displays (projects) an image on the screen SC based on the selected input source.
Although FIG. 1 illustrates an example of floor-standing installation in which the projector 10 is placed on the floor in front of the screen SC, the projector 10 may be suspended from the ceiling and installed. In the present embodiment, the case where the projector 10 projects onto a flat screen SC is illustrated, but the projection target is not limited to the screen SC, and may be a flat surface such as a wall surface of a building, or a curved surface or an uneven surface. Good.

The document camera 50 is connected to the projector 10 via USB by a USB cable 59.
The document camera 50 includes a base 52, a mounting surface 54, an arm 56, a camera head 58, and an operation panel 60. The base 52 is a flat plate-shaped base that supports the document camera 50, and the upper surface of the base 52 is a mounting surface 54 on which the subject T is placed.
The subject T is, for example, a sheet such as paper on which characters or pictures are drawn, or a bound book, but the size and shape are not limited as long as it can be placed on the mounting surface 54.

The arm 56 is erected on the base 52, and the camera head 58 is fixed to the tip of the arm 56. The arm 56 may be fixed to the base 52, or the connecting portion connecting the arm 56 and the base 52 is provided with a rotating mechanism, and the arm 56 can be folded toward the base 52 by this rotating mechanism. It may be configured.
The camera head 58 includes an imaging unit 90 (FIG. 2) supported by the arm 56 and facing the mounting surface 54. The imaging unit 90 images the subject T mounted on the mounting surface 54.

The operation panel 60 is provided on, for example, the upper surface of the base 52. The operation panel 60 includes a plurality of buttons (button-type switches) operated by the user, as will be described later with reference to FIG. 3, and inputs an operation command to the document camera 50 by the user.
The document camera 50 receives an operation of the user by the operation panel 60, images the subject T by the imaging unit 90 (FIG. 2) in response to this operation, and outputs image data based on the captured image to the projector 10.

FIG. 2 is a functional block diagram showing a functional configuration of the projector 10 and the document camera 50.
The projector 10 includes a control unit 20, a storage unit 22, an operation unit 24, a USB interface (USB I / F) unit 26, an input interface (I / F) unit 28, an input source switching unit 30, an image processing unit 32, and the like. A projection unit 34 is provided. Reference numeral 36 denotes a bus, which connects the control unit 20 and each unit other than the projection unit 34, and the control unit 20 transmits and receives control data via the bus 36. Further, the projector 10 includes a remote controller 38 operated by the user.

The control unit 20 includes a CPU (Central Processing Unit) (not shown), and the CPU executes a control program to control each unit of the projector 10. In addition to the CPU, the control unit 20 includes a ROM (Read Only Memory) (not shown) that non-volatilely stores basic control programs and setting data executed by the CPU, and a RAM (Random Access Memory) that forms a work area of the CPU. (Not shown) may be provided.

The storage unit 22 stores the control program executed by the control unit 20 and various data processed by the control unit 20. Examples of this type of program include well-known USB modules, USB class drivers, image display programs, and the like.

The operation unit 24 is a function unit for inputting an operation command from the user to the projector 10, and functions as a reception unit for receiving the operation of the user. The operation unit 24 is connected to an operation panel 31 having switches and buttons operated by the user, and detects the operation of the switches and buttons on the operation panel 31. The operation panel 31 includes, for example, a power switch for turning on / off the power of the projector 10, an input source switching button (not shown) for switching the input source of the image displayed on the projector 10. Further, the operation panel 31 may be provided with a switch or a button for instructing the document camera 50 to adjust the zoom magnification, that is, to enlarge or reduce the zoom ratio. Further, a switch or a button for instructing the adjustment of the optical zoom magnification in the projection unit 34 may be provided.

Further, the operation unit 24 may include a remote control light receiving unit (not shown) that receives an infrared signal transmitted by the remote control 38. The remote controller 38 includes various buttons including an input source switching button (not shown) for switching the input source of the image displayed by the projector 10, and transmits an infrared signal indicating the operated button. The operation unit 24 outputs data corresponding to the operation contents of the operation panel 31 and the remote controller 38 to the control unit 20.

The USB interface unit 26 is an interface for transmitting and receiving various data including control data and image data to and from an external device in accordance with USB (Universal Serial Bus). In the present embodiment, the document camera 50 is connected to the USB interface unit 26 by the USB cable 59.

The input interface unit 28 includes an interface to which an external device is connected. The input interface unit 28 transmits / receives data including control data and image data to / from an external device. Further, the input interface unit 28 may include an analog interface (not shown) to which an analog image signal or an analog audio signal is input, and specifically, includes an RGB interface, a video interface, an S-video interface, and the like. May be good. In the present embodiment, the personal computer 201, the VTR 202, and the DVD player 203 are connected to the input interface unit 28, respectively. The input interface unit 28 may include an A / D converter that converts an analog signal input to the analog interface into digital data.

The input source switching unit 30 selects one interface as an input source from the interfaces provided in the USB interface unit 26 and the input interface unit 28 according to the control of the control unit 20.

The image processing unit 32 generates display image data for image display based on the image data or video data input from the interface selected by the input source switching unit 30.
The projection unit 34 modulates the light emitted by the light source based on a light source (not shown) and display image data generated by the image processing unit 32 to generate image light, and an image light emitted by the light modulator. It is equipped with a projection optical system that projects light sources. The light source of the projection unit 34 is, for example, a xenon lamp, an ultrahigh pressure mercury lamp, an LED (Light Emitting Diode), a laser light source, or the like. The light modulator includes, for example, three transmissive liquid crystal panels corresponding to the three primary colors of RGB, and the light emitted by the light source is separated into the three color lights of RGB and incident on each liquid crystal panel corresponding to each color light. The liquid crystal panel of the optical modulator modulates the light incident from the light source, and the modulated colored light is synthesized by a synthetic optical system such as a cross dichroic prism and emitted to the projection optical system. The projection optical system includes an optical component such as a lens, and forms an image of image light modulated by an optical modulator on the screen SC.

The document camera 50 includes a control unit 70, a storage unit 72, an operation unit 74, a USB interface (USB I / F) unit 76, a lighting unit 78, a lighting control unit 80, an image processing unit 84, a resolution conversion unit 86, and an imaging unit. The unit 90 is provided. Reference numeral 88 denotes a bus, which connects the control unit 70 and each part of the document camera 50 excluding the operation panel 60, the lighting unit 78, and the imaging unit 90.

The control unit 70 is composed of a microcomputer including a CPU, ROM, non-volatile memory, RAM, etc., a DSP (Digital Signal Processor), and the like. The control unit 70 executes a computer program stored in the storage unit 72 and controls each unit of the document camera 50. The storage unit 72 stores various programs executed by the control unit 70 and data processed by the control unit 70. For example, the storage unit 72 stores a well-known USB module, a USB class driver, a program for controlling the image pickup unit 90, and the like.
Further, the storage unit 72 stores the setting data 72b related to the operation of the zoom control unit 70a, which will be described later.

The USB interface unit 76 is an interface for exchanging control data, image data, and the like with an external device in accordance with the USB standard. In this embodiment, the USB interface unit 76 is connected to the USB interface unit 26 of the projector 10. The USB interface unit 76 corresponds to the "communication unit" which is a component of the present invention.

The illumination unit 78 is a light source such as an LED that irradiates the subject T with light, and is arranged on the camera head 58 (FIG. 1). The lighting control unit 80 controls the lighting and extinguishing of the light source of the lighting unit 78 according to the control of the control unit 70. Further, the illumination control unit 80 may have a configuration in which the brightness of the light source included in the illumination unit 78 can be adjusted.

The image pickup unit 90 includes an image pickup lens 91 and an image pickup element 92 composed of a CCD (Charge Coupled Device), CMOS (Complementary MOS), or the like. The image pickup lens 91 is composed of a lens or a lens group, and constitutes an optical system for photographing the subject T. The image pickup lens 91 is housed in a tubular lens barrel 93 and can move along the optical axis AX.
The imaging unit 90 includes a lens operating unit 98 that moves the imaging lens 91 along the optical axis AX. The lens operating unit 98 moves each lens contained in the lens barrel 93 or in the lens barrel 93 in the optical axis AX direction. In the present embodiment, the lens operating unit 98 has a motor 94 and a gear 94a that transmits the rotational force of the motor 94 to the lens barrel 93. Further, the lens barrel 93 has, for example, a cylindrical shape, and has a configuration in which the distance between the lens barrel 93 and the image sensor 92 changes by rotating the lens barrel 93 in the circumferential direction about the optical axis AX. Therefore, by driving the motor 94, the lens barrel 93 connected via the gear 94a rotates, and the distance between the image pickup lens 91 and the image sensor 92 can be changed. Further, the moving directions of the lens barrel 93 are opposite when the motor 94 is rotated in the forward direction and when the motor 94 is rotated in the opposite direction. Therefore, the moving direction of the lens barrel 93 is determined by the rotation direction of the motor 94.

The lens operating unit 98 adjusts the focusing state (focus) of the image sensor 92 and the optical zoom magnification by rotating the motor 94. The motor 94 is composed of, for example, a stepping motor, and the current position of the motor 94 can be specified based on the history of the number of operation steps of the motor 94. From the position of the motor 94, the position of the lens barrel 93 in the optical axis AX direction can be obtained. The lens operating unit 98 includes a driving unit (not shown) that supplies a driving current to the motor 94. When the motor 94 is composed of a stepping motor, the drive unit (not shown) of the lens operating unit 98 outputs a drive pulse to the motor 94 based on the control signal input from the image processing unit 84.
Further, the lens operating unit 98 may include a detection unit (not shown) including a linear encoder, a rotary encoder, or the like that detects the position of the motor 94 or the position of the lens barrel 93.

The image pickup unit 90 includes an output circuit 95 that detects a signal from the image pickup element 92, generates captured image data, and outputs the captured image data to the image processing unit 84.

The image processing unit 84 is connected to the image pickup unit 90 and drives the image pickup unit 90 according to the control data input from the control unit 70. The image processing unit 84 outputs a drive signal to the lens operating unit 98 to operate the motor 94, thereby moving the lens barrel 93. Further, the image processing unit 84 executes image processing such as converting the captured image data output by the output circuit 95 into a form of image data that can be processed by the control unit 70, and transfers the processed data to the control unit 70. Output.

The control data input from the control unit 70 to the image processing unit 84 can be, for example, control data for instructing the execution of focus adjustment and control data for designating the optical zoom magnification. In this case, the image processing unit 84 moves the image pickup lens 91 according to the designated optical zoom magnification when the control data for specifying the optical zoom magnification is input from the control unit 70. The drive signal is output to. Further, the image processing unit 84 determines the focusing state based on the captured image data output by the output circuit 95 when the control data instructing the execution of the focus adjustment is input from the control unit 70, and the lens operating unit 84. The drive signal is output to 98. For example, the image processing unit 84 performs image processing such as edge detection and contrast measurement on the captured image data to determine the in-focus state. Then, the image processing unit 84 moves the image pickup lens 91 by the lens operating unit 98, and identifies the optimum position of the image pickup lens 91 based on the change in the focusing state of the image pickup image data accompanying the movement of the image pickup lens 91.

In the present embodiment, the control unit 70 can output control data for designating the target value of the operation of the motor 94 to the image processing unit 84, as will be described later as the operation of the zoom control unit 70a. When the control unit 70 inputs control data for designating the target value of the operation of the motor 94, the image processing unit 84 rotates the motor 94 to the position indicated by the designated target value.

The resolution conversion unit 86 performs a process of converting the resolution of the captured image data output by the image processing unit 84 into a resolution designated by the control unit 70. The control unit 70 determines the resolution of the image data output from the document camera 50 to the projector 10 based on the control data input from the projector 10 via the USB interface unit 76, and converts the conversion to this resolution into a resolution. Let unit 86 execute.

The operation unit 74 detects an operation on the operation panel 60 (FIG. 1) and outputs data indicating the operation content to the control unit 70. The operation unit 74 is not limited to the operation panel 60, and may include other operation devices (not shown) operated by the user.
The operation unit 74 and the zoom operation unit 66 (FIG. 3) included in the operation panel 60 are functional units for inputting operation commands from the user. The operation unit 74 and / or the zoom operation unit 66 functions as a reception unit that accepts the user's operation.

FIG. 3 is a plan view of a main part showing a configuration example of the operation panel 60.
The operation panel 60 includes a power button 61 for operating the power on / off of the document camera 50. Further, the operation panel 60 includes a menu button 63, an [Esc] button 64, and a direction instruction button 65. Further, the operation panel 60 includes a zoom operation unit 66, a focus button 67, a still / shooting button 68, and a recording button 69.

The menu button 63 is a button for displaying a menu for setting the functions of the document camera 50. When the menu button 63 is operated, the operation unit 74 outputs control data indicating the operation of the menu button to the control unit 70. The control unit 70 generates image data for displaying a menu having a hierarchical structure according to the control data input from the operation unit 74, and outputs the image data to the projector 10.

The direction instruction button 65 is a button for instructing four directions of up, down, left, and right, and a decision button 65a is arranged in the center. The direction instruction button 65 is used for an operation of selecting an item in the menu displayed by the operation of the menu button 63. The decision button 65a is a button for instructing confirmation with respect to the selection by the operation of the direction instruction button 65. Further, the [Esc] button 64 is a button for instructing the end of the function being executed, and in the state where the menu is displayed, instructing the transition to the next higher hierarchy of the displayed hierarchy. The operation unit 74 detects the pressing operation of the direction indicating button 65 in each of the up / down / left / right directions and the pressing operation of the decision button 65a, and outputs the control data corresponding to the operation to the control unit 70. The control unit 70 transitions the image data according to the control data input from the operation unit 74. By operating the [Esc] button 64, the direction instruction button 65, and the enter button 65a, the user can operate the menu of the hierarchical structure and make various settings for the functions of the document camera 50.

Further, the direction indicator button 65 functions as a brightness adjustment button when the menu is not displayed. The brightness adjustment button is a button for instructing a change in the brightness of the image data generated by the control unit 70 based on the image captured by the image capturing unit 90. The upward operation of the direction indicator button 65 corresponds to the instruction to increase the brightness, and the downward operation of the direction indicator button 65 corresponds to the instruction to decrease the brightness. The control unit 70 adjusts the brightness of the image data to be output to the projector 10 when the control data indicating the upward or downward direction of the direction instruction button 65 is input from the operation unit 74 without displaying the menu. Specifically, the control unit 70 outputs control data to the lighting control unit 80 to change the brightness of the light source, and / or controls to specify the brightness of the image data to the image processing unit 84. Performs data output processing.

The zoom operation unit 66 is a button for instructing the image pickup unit 90 to change the zoom magnification when the subject T (FIG. 1) is imaged. The zoom operation unit 66 includes a zoom UP button 66a for instructing an increase in the zoom magnification and a zoom DOWN button 66b for instructing a decrease in the zoom magnification, and the zoom UP button 66a and the zoom DOWN button 66b are pressed independently of each other. it can. The focus button 67 is a button for instructing focus adjustment. When the operation unit 74 detects the operation of the zoom UP button 66a, the zoom DOWN button 66b, and the focus button 67, the operation unit 74 outputs control data corresponding to the operated buttons to the control unit 70.

The still / shooting button 68 is a button that instructs the function of stopping the image output by the document camera 50 to the projector 10 and the function of saving the captured image data captured by the imaging unit 90. The operation unit 74 of the present embodiment repeatedly outputs control data indicating the pressing of the stationary / photographing button 68 at a preset sampling cycle while the stationary / photographing button 68 is pressed. Based on the control data input from the operation unit 74, the control unit 70 presses the still / shooting button 68 and releases it within a predetermined time (releases the pressing), and presses the still / shooting button 68 for a predetermined time. Distinguish from operations that continue to be pressed beyond. When the still / shooting button 68 is pressed within a predetermined time, the control unit 70 executes a function of stopping the image output to the projector 10 by the document camera 50. Further, when the time when the still / photographing button 68 is pressed exceeds a predetermined time, the control unit 70 performs a process of saving the captured image data captured by the imaging unit 90. The recording button 69 is a button for instructing a process of saving the captured image data of the imaging unit 90 as moving image data.

The operation unit 74 detects the operation state of each button included in the operation panel 60 at a predetermined sampling cycle, and outputs control data indicating the operation. When any button on the operation panel 60 continues to be pressed, the operation unit 74 outputs control data indicating the operation while the pressing continues. For example, when the zoom UP button 66a is pressed, control data indicating the operation of the zoom UP button 66a is output until the press is released. Control data indicating the operation of the zoom UP button 66a is repeatedly input to the control unit 70 according to the sampling cycle of the operation unit 74 or the input of the control data. The control unit 70 detects the operation of the buttons and switches on the operation panel 60 based on the control data input from the operation unit 74. Further, as will be described later, the control unit 70 can detect a state in which the buttons and switches on the operation panel 60 are continuously pressed and a state in which the pressing is released.

The control unit 70 controls each part of the document camera 50, images the subject T by the image pickup unit 90, and outputs the image data based on the captured image data to the projector 10 by the USB cable 59.
Further, the control unit 70 includes a zoom control unit 70a and a focus control unit 70b. Each of these units is realized by the cooperation of software and hardware when the CPU of the control unit 70 executes the above-mentioned program.

The zoom control unit 70a changes the optical zoom magnification and / or enlarges / reduces the captured image data based on the control data indicating the operation of the zoom UP button 66a and the zoom DOWN button 66b input from the operation unit 74. Perform the process to change. That is, the operation of the zoom UP button 66a and the zoom DOWN button 66b is an instruction for adjusting the lens position. When the operations of the zoom UP button 66a and the zoom DOWN button 66b are released, the zoom control unit 70a detects the release of the operation as the end of the lens position adjustment instruction.
The zoom control unit 70a has a threshold value for determining that the operation on the operation panel 60 has been released. The threshold value for the release determination is a value corresponding to a length of time exceeding the sampling cycle of the operation unit 74 or the input cycle of the control data, and is stored in the storage unit 72 or the ROM (not shown) included in the control unit 70. Will be done. In the present embodiment, the setting data 72b stored in the storage unit 72 includes the threshold data for the release determination. The zoom control unit 70a determines that the operation of the zoom UP button 66a has been canceled when, for example, the time exceeding the threshold value for the release determination has elapsed after the input of the control data indicating the operation of the zoom UP button 66a has disappeared. To do. The same applies to the operation of the zoom DOWN button 66b. Based on the control data input from the operation unit 74, the zoom control unit 70a can detect the state in which the buttons and switches on the operation panel 60 are continuously pressed and the release of the pressing.

As described above, the document camera 50 has an optical zoom function in which the lens operating unit 98 operates the motor 94 to enlarge / reduce the captured image. In addition, the document camera 50 has a digital zoom function that performs image processing for enlarging / reducing the captured image data output by the output circuit 95. The image processing unit 84 executes the image processing related to the digital zoom function. The optical zoom function and the digital zoom function can be independently turned on / off by, for example, menu operation using the menu button 63 or the like. According to this setting, the zoom control unit 70a changes the optical zoom magnification or the digital zoom magnification according to the operation of the zoom UP button 66a or the zoom DOWN button 66b. When the digital zoom magnification is changed, the zoom control unit 70a outputs control data indicating the changed digital zoom magnification to the image processing unit 84, and the image processing unit 84 enlarges the captured image data according to the changed zoom magnification. Or perform image processing to reduce.

When changing the optical zoom magnification, the zoom control unit 70a outputs control data for designating a target value of the optical zoom magnification to the image processing unit 84. The image processing unit 84 outputs a drive signal to the lens operating unit 98 in accordance with the target value of the optical zoom magnification specified by the control data output by the zoom control unit 70a. The lens operating unit 98 operates the motor 94 based on the drive signal input from the image processing unit 84 to move the image pickup lens 91.

The drive signal output by the image processing unit 84 to the lens operating unit 98 can be, for example, a signal corresponding to the operating pulse of the motor 94. In this case, when the image processing unit 84 outputs one drive signal to the lens operating unit 98, one drive pulse is input to the motor 94. This drive signal may include information that specifies the direction of rotation of the motor 94.
Further, the drive signal output by the image processing unit 84 may be control data indicating the number of drive pulses output to the motor 94. In this case, the lens operating unit 98 inputs a number of drive pulses specified by the control data input from the image processing unit 84 to the motor 94. This control data may include data that specifies the rotation direction of the motor 94.

The focus control unit 70b outputs control data instructing the image processing unit 84 to execute the focus adjustment, and causes the image processing unit 84 to execute the focus adjustment. Focus adjustment is performed when control data instructing execution of focus adjustment is input from the operation unit 74 to the control unit 70, when the power of the document camera 50 is turned on, when imaging of the subject T is started, and the like. Is executed. The focus adjustment controlled by the focus control unit 70b is executed by moving the image pickup lens 91. When the focus control unit 70b outputs control data instructing the image processing unit 84 to adjust the focus, the image processing unit 84 outputs a drive signal to the lens operating unit 98 according to the input control data. This drive signal is similar to the drive signal described above with respect to the optical zoom adjustment.

With this configuration, the document camera 50 captures the subject T by the imaging unit 90, generates image data for display at a resolution suitable for the projector 10 based on the captured image data, and outputs the image data to the projector 10. Then, the projector 10 projects the image of the subject T mounted on the base 52 onto the screen SC. When the user operates the focus button 67, the focus is adjusted to the subject T. Therefore, even if the subject T is a thick object or a book, a high-quality image in focus can be projected by the projector 10. .. Further, since the user can adjust the zoom magnification at the time of imaging the subject T by operating the zoom UP button 66a and the zoom DOWN button 66b, the image of the subject T can be projected by the projector 10 at an arbitrary magnification.

In the following description, an example in which the digital zoom function is set to off and the optical zoom function is executed in response to the operation of the zoom UP button 66a and the zoom DOWN button 66b will be described. Further, the motor 94 is composed of a stepping motor, and the operating position of the motor 94 is specified by the number of operating steps.

FIG. 4 is a diagram showing an example of the operating range of the motor 94.
The motor 94 of the present embodiment can be operated in a range of 1 to 120 steps, and this operating range corresponds to 1.00 to 20.00 times the optical zoom magnification. The zoom control unit 70a can operate by designating the operating position of the motor 94 within the range of 1 to 120, the limit value on the low (wide) side of the optical zoom magnification is 1, and the optical zoom magnification is high (tele). The limit value on the) side is 120. In other words, the operating range of the motor 94 is set so that the upper limit at the telephoto end is 120 and the lower limit at the wide end is 1. The storage unit 72 stores the number of operation steps of the motor 94, that is, the value of the optical zoom magnification corresponding to the operation position. Regarding the correspondence between the number of operation steps of the motor 94 and the optical zoom magnification, for example, when a numerical value of the optical zoom magnification of the imaging unit 90 is specified, the zoom control unit 70a adjusts to the specified optical zoom magnification of the motor 94. It is used when operating. The numerical value of the optical zoom magnification may be specified, for example, by operating the direction indicator button 65 on the operation panel 60 or by a command input from the projector 10. In this case, the command input from the projector 10 is an instruction for adjusting the lens position.

The zoom control unit 70a outputs control data for rotating the motor 94 by a preset predetermined amount each time the zoom UP button 66a or the zoom DOWN button 66b is operated once. More specifically, the zoom control unit 70a sets a position when the motor 94 is rotated by a preset predetermined amount from the current operating position of the motor 94 as a "target value", and sets the motor 94 up to this target value. Outputs control data instructing to rotate. The image processing unit 84 rotates the motor 94 according to the target value specified by the control data.
Here, the preset predetermined amount can be set to one step, for example, when the motor 94 is composed of the stepping motor 94.

Further, when the zoom control unit 70a detects the operation of the zoom UP button 66a or the zoom DOWN button 66b and determines that the operation is continued based on the threshold value of the release determination described above, the duration of the operation is continued. To count. The zoom control unit 70a uses the auto-repeat determination time as a threshold value for the duration of the operation or a determination reference value. The value of the auto-repeat determination time is included in the setting data 72b stored in the storage unit 72, for example. When the duration of the operation of the zoom UP button 66a or the zoom DOWN button 66b is within the auto-repeat determination time, the zoom control unit 70a determines that this operation is one normal operation. In other words, the normal operation is an operation of pressing the zoom UP button 66a or the zoom DOWN button 66b once and releasing the pressing within the auto-repeat determination time. On the other hand, when the duration of the operation of the zoom UP button 66a or the zoom DOWN button 66b exceeds the auto-repeat determination time, the zoom control unit 70a determines that this operation is an auto-repeat operation. Specifically, the auto-repeat operation is an operation in which the zoom UP button 66a or the zoom DOWN button 66b is continuously pressed.

The zoom control unit 70a counts the duration of the operation during the operation of the zoom UP button 66a or the zoom DOWN button 66b. Then, when the operation is canceled within the auto-repeat determination time, the zoom control unit 70a determines that it is a normal operation and outputs control data for designating the above target value to the image processing unit 84.
The operation corresponding to this normal operation corresponds to the first adjustment operation. The first adjustment operation may include a process of setting a target value based on a predetermined amount in response to a normal operation, and may include a process of transmitting control data for designating the target value to the image processing unit 84. Further, the image processing unit 84 may include a process of operating and stopping the motor 94 based on the designated target value.

Further, the zoom control unit 70a determines that the operation is an auto-repeat operation even before it is determined that the operation is canceled when the duration of the operation exceeds the auto-repeat determination time. At this point, the zoom control unit 70a outputs control data for designating a target value corresponding to the auto-repeat operation to the image processing unit 84. In this case, the target value specified by the zoom control unit 70a is the upper limit or the lower limit of the operating range of the motor 94. The operation of the zoom UP button 66a is an instruction to increase the zoom magnification, and corresponds to an instruction to move the image pickup lens 91 to the telephoto side. The operation of the zoom DOWN button 66b is an instruction to lower the zoom magnification, and corresponds to an instruction to move the image pickup lens 91 to the wide side. When the zoom control unit 70a determines that the operation of the zoom UP button 66a is an auto-repeat operation, the zoom control unit 70a sets the limit value (120 steps) on the tele side of the operating range (1 to 120 steps) of the motor 94 as the target value. .. When it is determined that the operation of the zoom DOWN button 66b is an auto-repeat operation, the limit value (1 step) on the wide side of the operating range of the motor 94 is set as the target value. The limit value on the telephoto side is the upper limit of the operating range of the motor 94, and the limit value on the wide side is the lower limit of the operating range.

The operation panel 60 of the present embodiment includes a zoom UP button 66a and a zoom DOWN button 66b as two controls corresponding to instructions for enlarging and reducing the zoom magnification. Corresponding to this configuration, the zoom control unit 70a sets the limit value on the telephoto side or the limit value on the wide side of the operating range of the motor 94 as a target value when the auto-repeat operation of each operator is detected.

Further, the zoom control unit 70a outputs control data indicating a target value to the image processing unit 84 when the instruction data relating to the change of the zoom magnification is input from the projector 10 via the USB cable 59. May be good. That is, the zoom magnification of the document camera 50 may be changed by operating the projector 10. Specifically, the control unit 20 of the projector 10 may be configured to detect an instruction to increase the zoom magnification or an instruction to reduce the zoom magnification by operating the remote controller 38 or the operation panel 31. In this case, the control unit 20 may output a command instructing enlargement or reduction of the zoom magnification via the USB cable 59. Further, the control unit 20 may continue to output the above command while the operation of instructing the enlargement or reduction of the zoom magnification is being performed. The zoom control unit 70a determines whether the operation is continued or the operation is canceled based on the threshold value for the release determination while the command for instructing the enlargement or reduction of the zoom magnification is input from the projector 10. The threshold value for release determination may be the same as the threshold value for release determination applied to the data input from the operation unit 74, or may be a dedicated threshold value applied to the command from the projector 10. For example, it is included in the setting data 72b stored in the storage unit 72. The zoom control unit 70a determines that the operation has been canceled when a time exceeding the threshold value for the release determination has elapsed after the command input from the projector 10 is stopped.
When the zoom control unit 70a detects an operation instructing the enlargement or reduction of the zoom magnification in the projector 10 by a command, the zoom control unit 70a may count the duration of the operation. When the operation is canceled within the auto-repeat determination time, the zoom control unit 70a determines that the operation is normal, and sends control data to the image processing unit 84 that specifies a target value corresponding to a predetermined amount of operation of the motor 94. Output. Further, when the duration of the operation for instructing the enlargement or reduction of the zoom magnification in the projector 10 exceeds the auto-repeat determination time, the zoom control unit 70a determines that the operation is an auto-repeat operation. In this case, the zoom control unit 70a outputs control data for designating the upper limit or the lower limit of the operating range of the motor 94 as a target value to the image processing unit 84.

The image processing unit 84 outputs a drive signal to the lens operating unit 98 according to the target value input from the zoom control unit 70a to operate the motor 94. When the motor 94 is operated from the stopped state and stopped at the position of the target value, it is necessary to control the acceleration and deceleration of the motor 94, and the image processing unit 84 controls the acceleration and deceleration of the lens operating unit 98. Adjust the drive signal to be output to. When the motor 94 is composed of a stepping motor, a drive pulse for controlling acceleration and deceleration is input to the motor 94 based on a drive signal output by the image processing unit 84.

If the zoom control unit 70a determines that the operation is an auto-repeat operation before determining that the operation has been canceled, the zoom control unit 70a provides the image processing unit 84 with control data whose target value is the upper limit or the lower limit of the operating range of the motor 94. Output. Even during the process of outputting the control data, the zoom control unit 70a monitors whether or not the operation is canceled based on the threshold value for the release determination, and waits for the release of the operation. Then, when it is determined that the operation has been released, the zoom control unit 70a outputs control data instructing the stop of the motor 94 to the image processing unit 84. The operation when the zoom control unit 70a determines that the operation is canceled is executed as an interrupt process. For example, an emergency stop command for urgently stopping the motor 94 is output from the zoom control unit 70a to the image processing unit 84.

In the auto-repeat operation, the image processing unit 84 outputs a drive signal in order to move the motor 94 to the upper limit or the lower limit of the operating range of the motor 94 according to the control data input from the zoom control unit 70a. If an emergency stop command is input from the zoom control unit 70a while the drive signal is being output, the image processing unit 84 controls the drive signal for stopping the motor 94. The image processing unit 84 may immediately stop the output of the drive signal output to the lens operating unit 98 after the emergency stop command is input. Further, the image processing unit 84 may output a drive signal corresponding to the operation of the motor 94 during the deceleration period, which will be described later, to the lens operating unit 98 after the emergency stop command is input.
When the motor 94 is stopped based on the emergency stop command, the position where the motor 94 stops may differ from the target value. Therefore, the image processing unit 84 detects the position where the motor 94 has stopped, or obtains the stop position of the motor 94 based on the drive signal until the motor 94 is stopped. The image processing unit 84 notifies the zoom control unit 70a of the position where the motor 94 has stopped.

The operation corresponding to the auto-repeat operation corresponds to the second adjustment operation. The second adjustment operation includes a process of setting an upper limit or a lower limit of the operating range of the motor 94 as a target value in response to the auto-repeat operation, and transmits control data for designating the target value to the image processing unit 84. Processing may be included. Further, the second adjustment operation may include a process in which the image processing unit 84 operates and stops the motor 94 based on the designated target value. The second adjustment operation includes a process in which the zoom control unit 70a determines the cancellation of the auto-repeat operation, a process of outputting an emergency stop command when the cancellation of the operation is determined, and an image processing in response to the emergency stop command. The unit 84 may include a process of stopping the motor 94.

5A and 5B are explanatory views showing an operation example of the motor 94, and FIGS. 5A and 5B are charts showing changes in the rotation speed of the motor 94 when the motor 94 is driven.
The horizontal axes of (A) and (B) in FIG. 5 indicate the passage of time, and the vertical axis indicates the speed, both of which are from when the motor 94 starts rotating according to the drive signal output by the image processing unit 84 until it stops. Represents a change in the speed of.

FIG. 5A shows an example in which the zoom control unit 70a outputs control data indicating a target value for operating the motor 94 by a predetermined amount to the image processing unit 84. The operation example M1 shown in FIG. 5A shows the change in the speed of the motor 94 while the motor 94 starts rotating at time t1 and stops at time t2. In the acceleration period P1 starting from time t1, the speed of the motor 94 is accelerated from the stopped state (speed 0) to the rated speed V1. Further, before the time t2 when the motor 94 is stopped, there is a deceleration period P2 for decelerating the motor 94 from the speed V1. The image processing unit 84 acquires a target value specified by the control data input from the zoom control unit 70a, and outputs a drive signal for operating the motor 94 to the position of the acquired target value. The image processing unit 84 generates a drive signal pattern including the acceleration period P1 and the deceleration period P2 based on the position of the target value and the current position of the motor 94, and outputs the drive signal according to this pattern. Further, if the distance or interval from the position of the motor 94 at the start of operation to the position of the target value is short, the speed of the motor 94 may not reach the rated speed V1. Even in such a case, the image processing unit 84 outputs a drive signal including the acceleration period P1 and the deceleration period P2 so as to drive the motor 94 to the position of the target value accurately.
In the operation example shown in FIG. 5A, in order to secure the acceleration period P1 and the deceleration period P2 depending on the operating amount of the motor 94 corresponding to the target value set by the zoom control unit 70a, that is, the predetermined amount. The motor 94 may not be accelerated to the rated speed V1. That is, when the time that can be allocated to the acceleration period P1 and the deceleration period P2 is short, the speed of the motor 94 at the time of starting the deceleration period P2 is likely to be lower than the rated speed V1.

Operation examples M2 and M3 shown in FIG. 5B show a case where the zoom control unit 70a outputs control data whose target value is the upper limit or the lower limit of the operating range of the motor 94 in response to the auto-repeat operation. In this case, the image processing unit 84 rotates the motor 94 from the time t11 with the upper limit or the lower limit of the operating range of the motor 94 as the target value. The motor 94 is accelerated in the acceleration period P11 and reaches the rated speed V1. When the motor 94 operates to the position of the target value, as shown in the operation example M3, the motor 94 continues to rotate at the rated speed V1 and then stops at the time t12 after the deceleration period P12.
When an emergency stop command for the motor 94 is input from the zoom control unit 70a to the image processing unit 84 at time t13, the image processing unit 84 starts the deceleration period P13 to stop the motor 94. In the example of FIG. 5B, an emergency stop command is input while the motor 94 is rotating at the rated speed V1, but the emergency stop command may be input during the acceleration period P11 or the deceleration period P12. .. Further, as described with reference to FIG. 5A, if the distance or interval from the position of the motor 94 at the start of operation to the position of the target value is short, the motor 94 may not reach the rated speed V1. is there.
When the emergency stop command is input, the image processing unit 84 stops the motor 94 after the deceleration period P13, so that the stop position of the motor 94 can be accurately controlled. Further, the image processing unit 84 may stop the supply of the drive pulse to the motor 94 without starting the deceleration period P13 when the emergency stop command is input.

In this way, when the operation panel 60 or the projector 10 is operated to change the zoom magnification, the zoom control unit 70a outputs control data of a target value for operating the motor 94 by a predetermined amount, and the image processing unit 84 displays the control data. The motor 94 is operated by a predetermined amount. In this case, the imaging lens 91 moves by a predetermined amount in response to one operation of the operation panel 60 or the projector 10, and the captured image data of the imaging unit 90 changes, and the projector that projects the captured image data. The projected image of 10 changes.
Further, when the operation panel 60 or the projector 10 is operated beyond the auto-repeat determination time, the motor 94 operates and the image pickup lens 91 moves before the operation is canceled. Therefore, before the operation is released, the projected image of the projector 10 changes as the image pickup lens 91 moves. Then, when the operation is released, the motor 94 is stopped and the image pickup lens 91 is stopped in response to the release.

The user can perform an operation of changing the zoom magnification while viewing the projected image of the projector 10. If the operation is within the auto-repeat determination time, the motor 94 rotates by a predetermined amount, and the projected image changes by the amount corresponding to the predetermined amount. By this operation, the user can gradually change the zoom magnification to adjust to a desired zoom magnification. Further, when the user performs an operation exceeding the auto-repeat determination time, the motor 94 operates with the upper limit or the lower limit of the operating range as a target. In many cases, the operating amount of the motor 94 in this case is larger than the above-mentioned predetermined amount. Therefore, when the user performs the operation for a long time, the motor 94 operates at a higher speed and continuously and greatly, so that the zoom magnification can be greatly changed. Then, when the user cancels the operation, the motor 94 is stopped by the emergency stop command, and the change in the zoom magnification is stopped.

Therefore, when the user performs an operation for a short time, the zoom magnification of the projected image of the projector 10 changes by a predetermined amount. Further, when the operation time performed by the user exceeds the auto-repeat determination time, the zoom magnification is continuously changed, so that the zoom magnification can be continuously changed with a small number of operations. Furthermore, if the operation is canceled at an arbitrary timing while viewing the projected image, the change in zoom magnification stops. Therefore, for example, by continuing to press the zoom UP button 66a or the zoom DOWN button 66b, the user can easily adjust to the desired zoom magnification.

The continuous operation of the motor 94 corresponding to the auto-repeat operation has a longer distance or interval from the position of the motor 94 at the start of operation to the position of the target value, as compared with the case where the operation within the auto-repeat determination time is repeated, for example. There are many. Therefore, the speed of the motor 94 is likely to reach the rated speed V1, and in many cases the zoom magnification can be changed at high speed. Further, when the auto-repeat operation is performed, there is an advantage that the amount of operation of the motor 94 corresponding to one operation is large and the image pickup lens 91 can be moved significantly as compared with the operation within the auto-repeat determination time. Further, since the motor 94 can be stopped urgently by canceling the operation, there is an advantage that the operation is easy.

6 and 7 are flowcharts showing the operation of the document camera 50, FIGS. 6 (A) and 7 (A) show the operation of the control unit 70, and FIGS. 6 (B) and 7 (B) show the operation of the control unit 70. The operation of the image processing unit 84 is shown.

The zoom control unit 70a of the control unit 70 monitors the operation of the zoom UP button 66a or the zoom DOWN button 66b of the operation panel 60 based on the control data input from the operation unit 74 (step S11), and while there is no operation (step S11). Step S11; No), wait. The standby in step S11 corresponds to a process that is always executed by the control unit 70 because interrupt processing is executed in response to the operation of the operation panel 60, for example.

When it is determined that the zoom UP button 66a or the zoom DOWN button 66b has been operated (step S11; Yes), the zoom control unit 70a starts counting the operation time (step S12).
The zoom control unit 70a determines whether or not the count value of the operation time exceeds the auto-repeat determination time (step S13), and if it is determined that it is equal to or less than the auto-repeat determination time (step S13; No), the operation is canceled. The presence or absence is determined (step S14). If it is determined that the operation detected in step S11 has not been released (step S14; No), the zoom control unit 70a returns to step S13.
If the auto-repeat determination time is exceeded while the operation detected in step S11 is not released (step S13; Yes), the zoom control unit 70a shifts to step S21 (FIG. 7). The operation in this case will be described later.

When it is determined that the operation has been canceled (step S14; Yes), the zoom control unit 70a has a target corresponding to the operating direction of the motor 94 corresponding to the detected operation and the set operating amount (predetermined amount) of the motor 94. The value is determined (step S15). The zoom control unit 70a generates control data indicating the determined target value, outputs the control data to the image processing unit 84, and sets the target value in the image processing unit 84 (step S16). The determination of cancellation of the operation is specifically an interrupt process. Therefore, before the determination in step S13 is performed, the cancellation of the operation may be determined (step S14; Yes), and the process may proceed to step S15.
The image processing unit 84 acquires a target value from the control data output by the zoom control unit 70a and sets it as a target value for operating the motor 94 (step S31).

The zoom control unit 70a outputs control data for setting the target value in step S16, and then outputs control data for notifying the start of operation of the motor 94 (step S17). The image processing unit 84 starts outputting a drive signal to the lens operating unit 98 according to the control data notifying the start of operation, and the lens operating unit 98 drives the motor 94 (step S32).
The image processing unit 84 stops the motor 94 at a position corresponding to the designated target value (step S33), and notifies the zoom control unit 70a of the completion of the operation of the set motor 94 (step S34). When the zoom control unit 70a receives the completion notification from the image processing unit 84, the zoom control unit 70a ends this processing (step S18).

If the zoom control unit 70a determines in step S13 that the count value exceeds the auto-repeat determination time before detecting the cancellation of the operation (step S13; Yes), the process proceeds to step S21 of FIG. The zoom control unit 70a sets a target value for auto-repeat corresponding to the operation detected in step S11 while maintaining the standby state for canceling the operation (step S21). In step S22, the zoom control unit 70a sets the target value on the side corresponding to the direction indicated by the operation in step S11 among the upper and lower limits of the operating range of the motor 94. The zoom control unit 70a outputs control data indicating a target value to the image processing unit 84.

The image processing unit 84 acquires a target value from the control data output by the zoom control unit 70a and sets it as a target value for operating the motor 94 (step S41).
The zoom control unit 70a outputs control data for setting the target value in step S22, and then outputs control data for notifying the start of operation of the motor 94 (step S23). The image processing unit 84 starts outputting a drive signal to the lens operating unit 98 according to the control data notifying the start of operation, and the lens operating unit 98 drives the motor 94 (step S42).

Here, when the zoom control unit 70a determines that the operation is canceled and an interrupt is performed (step S24), the zoom control unit 70a outputs an emergency stop command to the image processing unit 84 (step S25). Upon receiving the emergency stop command, the image processing unit 84 adjusts the output of the drive signal to the lens operating unit 98 to stop the motor 94 (step S43).
The image processing unit 84 notifies the zoom control unit 70a of the completion of the operation of the motor 94 (step S44). The zoom control unit 70a obtains a completion notification from the image processing unit 84 (step S26).
Further, the image processing unit 84 acquires or calculates the stop position of the motor 94 and notifies the zoom control unit 70a (step S45). The zoom control unit 70a acquires the position of the motor 94 (step S27), and ends this process.

The timing at which the zoom control unit 70a determines that the operation is canceled and interrupts is not necessarily after step S23. For example, even before step S22 or before step S23, the zoom control unit 70a may interrupt when determining the cancellation of the operation.

If an interrupt for canceling the operation occurs before notifying the start of operation in step S23, the zoom control unit 70a notifies in step S23 and then makes an emergency in step S25 as described with reference to FIG. All you have to do is output the stop command. In this case, the image processing unit 84 stops the motor 94 in step S43 in response to the emergency stop command after starting the output of the drive signal to the lens operating unit 98.

Further, the zoom control unit 70a does not send an emergency stop command unless it is determined that the operation has been released. In this case, the image processing unit 84 operates the motor 94 up to the upper limit or the lower limit of the operating range of the motor 94, which is the target value. When the motor 94 operates to the target value, the image processing unit 84 executes the operations of steps S33 and S34 (FIG. 6). In this case, the zoom control unit 70a executes the operation of step S18 (FIG. 6) to end this process.

The operations shown in FIGS. 6 and 7 are not limited to the operation of the zoom UP button 66a or the zoom DOWN button 66b of the operation panel 60. The zoom control unit 70a and the image processing unit 84 may execute the operations of FIGS. 6 to 7 in response to the commands output by the projector 10. Specifically, the target for the zoom control unit 70a to determine the start and release of the operation may be the control data output by the operation unit 74 or the command input from the projector 10. Good.

As described above, the document camera 50 according to the embodiment to which the present invention is applied has an imaging unit 90 capable of moving the imaging lens 91 in the optical axis AX direction by the operation of the motor 94, and an instruction for adjusting the position of the imaging lens 91. It is provided with an operation unit 74 that receives the above. The document camera 50 includes an optical adjustment unit including a control unit 70 and an image processing unit 84 that operate a motor 94 to adjust the position of the image pickup lens 91 of the image pickup unit 90 in response to an instruction received by the operation unit 74. When the duration of the instruction received by the operation unit 74 is less than or equal to the set period, the optical adjustment unit performs the first adjustment operation of driving the motor 94 by a predetermined amount. When the duration of the instruction received by the operation unit 74 is longer than the set period, the second adjustment operation for driving the motor 94 is performed based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor 94.
According to the document camera 50 as an electronic device and the control method of the electronic device executed by the document camera 50, the upper limit of the operating range of the motor 94 when the instruction for adjusting the position of the image pickup lens 91 continues longer than the set period. Alternatively, a target value corresponding to the lower limit is set. Then, based on this target value, the image processing unit 84 moves the motor 94 to adjust the position of the image pickup lens 91. Therefore, the motor 94 can be greatly operated according to the instruction, and the position of the image pickup lens 91 can be adjusted quickly.

The optical adjustment unit stops the motor 94 when the instruction received by the operation unit 74 ends after starting the second adjustment operation.
As a result, when the instruction is completed while the motor 94 is being moved based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor 94, the motor 94 is stopped. Therefore, by adjusting the timing of ending the instruction, the motor 94 can be stopped at an appropriate position, and the position of the image pickup lens 91 can be adjusted quickly.

Further, when the instruction received by the operation unit 74 is completed after the second adjustment operation is started, the document camera 50 stops the motor 94 even if the operation amount of the motor 94 does not reach the target value. As a result, when the instruction is completed while moving the motor 94 based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor 94, the motor 94 is stopped. Therefore, the adjustment can be started based on the target value that causes the motor 94 to operate significantly, and the motor 94 can be stopped in response to the end of the instruction. Therefore, the motor 94 can be greatly moved by one instruction, and the motor 94 can be stopped at the position during this operation, so that the restriction on the operation of the motor 94 can be relaxed. As a result, the position of the image pickup lens 91 can be adjusted quickly.

Further, the document camera 50 starts the second adjustment operation when the duration of the instruction exceeds the set period even before the instruction received by the operation unit 74 is completed. As a result, even before the instruction for adjusting the position of the image pickup lens 91 is completed, the motor 94 is moved based on the target value corresponding to the upper limit or the lower limit of the operating range of the motor 94 to quickly adjust the position of the image pickup lens 91. Can be done.

Further, the document camera 50 includes a configuration in which a control unit 70 sets a target value for the operation of the motor 94, and an image processing unit 84 drives the motor 94 based on the set target value. When executing the first adjustment operation, the control unit 70 sets a target value corresponding to a predetermined amount for each instruction received by the operation unit 74, and when executing the second adjustment operation, the operating range of the motor 94. Set a target value corresponding to the upper or lower limit.
As a result, the target value of the operation of the corresponding motor 94 is set depending on whether the instruction for adjusting the position of the image pickup lens 91 is less than or equal to the set period or exceeds the set period, so that the motor 94 is controlled based on the target value. it can. When setting a target value corresponding to the upper limit or the lower limit of the operating range of the motor 94, the image pickup lens 91 can be greatly moved in response to one instruction by setting the target value that can be regarded as the maximum. As a result, the position of the image pickup lens 91 can be adjusted quickly.

Further, the image processing unit 84 drives the motor 94 according to an operation pattern including an acceleration operation for accelerating the motor 94 and a deceleration operation for decelerating the motor 94. In the first adjustment operation, the motor 94 is made to execute an operation including a deceleration operation according to an operation pattern matching the set target value, and in the second adjustment operation, the motor 94 is operated after the instruction received by the operation unit 74 is completed. To execute the deceleration operation of. Therefore, even when the motor 94 is moved by setting the target value corresponding to the upper limit or the lower limit of the operating range of the motor 94, the deceleration operation can be performed and the motor 94 can be stopped appropriately.

The motor 94 is composed of a stepping motor, and the document camera 50 is an optical adjustment unit, a control unit 70 that sets a target value, and an image processing unit that outputs a drive signal to the motor 94 based on the target value set by the control unit 70. 84 and. Therefore, the motor 94 can be operated efficiently, and the position of the image pickup lens 91 can be adjusted quickly.

Further, the operation unit 74 is configured to be able to detect an operation on the zoom operation unit 66, detects the start of an instruction when the operation of the zoom operation unit 66 is started, and instructs that the operation of the zoom operation unit 66 is released. Detects the end of.
As a result, the first adjustment operation and the second adjustment operation can be executed depending on whether or not the time for operating the zoom operation unit 66 is equal to or less than the set time, and the position adjustment of the image pickup lens 91 can be performed quickly.

Further, the operation unit 74 may detect an instruction when an instruction signal is input from the projector 10. In this case, the control unit 70 determines that the instruction is continuous while the instruction signal is continuously input from the projector 10 or at a cycle of every predetermined time, and the instruction signal is input beyond the predetermined time. Detects the end of instructions when interrupted. As a result, the position of the image pickup lens 91 can be quickly adjusted by operating the motor 94 based on the instruction signal input from the outside.

Further, the document camera 50 is configured as an image pickup device including an image pickup element 92 that receives light transmitted through the image pickup unit 90, and the image pickup element is adjusted by adjusting the position of the image pickup lens 91 by the control unit 70 and the image processing unit 84. The imaging state at 92 is adjusted. As a result, the position of the image pickup lens 91 can be quickly adjusted, and for example, focus adjustment and zoom adjustment can be performed quickly.

It should be noted that the above-described embodiment is merely an example of a specific embodiment to which the present invention is applied, and does not limit the present invention. For example, in the above embodiment, an example in which the present invention is applied to the operation of adjusting the optical zoom magnification of the document camera 50 has been described. Not limited to this, the present invention may be applied to the operation of focus adjustment in the imaging unit 90. In this case, the focus control unit 70b executes the control of FIGS. 6 to 7 executed by the zoom control unit 70a. Further, the operation panel 60 includes a plurality of (for example, two) controls corresponding to the moving direction of the image pickup lens 91 as controls for manual focus adjustment that adjust the focus in response to the operation of the user. May be. The operation of these controls corresponds to an instruction for adjusting the lens position. Further, the focus may be adjusted by a command output from the projector 10 to the document camera 50. Further, for example, the configuration is not limited to the configuration in which the lens operating unit 98 is automatically operated under the control of the image processing unit 84. For example, the control unit 70 may be configured to operate the motor 94 by controlling the lens operating unit 98 without going through the image processing unit 84. In this case, the lens operating unit 98 may be connected to the control unit 70.

Further, regarding the operation of the motor 94, the preset predetermined amount may be one step or two or more steps when the motor 94 is composed of the stepping motor 94.

Further, the object to which the present invention is applied is not limited to the control of moving the image pickup lens 91 of the document camera 50, but also the control of moving the lens in a device having a configuration for moving the lens, which is an optical component, along the optical axis. Can be applied to. For example, it can be applied when the projection lens included in the projection unit 34 of the projector 10 is moved to adjust the optical zoom magnification or the focus. In this case, the configuration may be such that an operation corresponding to an instruction to move the projection lens, an instruction to change the optical zoom magnification, or an instruction to adjust the focus can be performed.
Further, the present invention is not limited to the document camera 50 and the projector 10, and can be applied to any device having a configuration for adjusting the focus adjustment and the optical zoom magnification by moving the lens. More specifically, the present invention can be applied to electronic devices such as digital still cameras, digital video cameras, mobile phones equipped with these cameras, smartphones, tablet computers, and notebook computers. Further, the present invention can also be applied to an imaging system composed of a digital still camera or a digital video camera and a computer connected to these cameras to acquire captured image data.
Further, in the various examples described above, it is preferable to have a configuration in which an image reflecting the movement of the lens is output so that the user who performs the operation can visually recognize the image. When the present invention is applied to the control of moving the imaging lens in the optical axis direction, it is preferable that the captured image is output while the imaging lens is moving so that the change in the captured image due to the movement of the imaging lens can be visually recognized. For example, the image pickup device including the document camera 50 may be provided with a display for displaying the captured image, or may be provided with a configuration for outputting the captured image data to the display device. Further, when the present invention is applied to the control of moving the projection lens in the optical axis direction, it is preferable that the change of the projected image due to the movement of the projection lens can be visually recognized while the projection lens is moving.

Further, in the above embodiment, the case where the present invention is applied to the control of the motor 94 composed of the stepping motor has been described, but the present invention may be applied to the control of the operation of the servo motor. In this case, it is preferable to include a detection unit (not shown) including a linear encoder, a rotary encoder, or the like for detecting the position of the motor.
Further, although the various controls included in the operation panel 60 have been described as buttons that can be pressed, the operation panel 60 may be composed of a touch panel or the like that detects a touch operation. In this case, the pressing operation of the embodiment can be replaced with the contact operation, and the release of the operation can be replaced with the release of the contact.
Further, the operation panel 60 can be configured as a remote control device separate from the document camera 50, and this remote control device may be connected to the document camera 50 by wire or wirelessly.

Further, the projector 10 and the document camera 50 are not limited to the wired connection by the USB cable 59, and may be connected via a communication interface other than USB such as HDMI (High-Definition Multimedia Interface) (registered trademark). .. In a configuration in which the projector 10 and the document camera 50 are connected by an interface capable of transmitting and receiving control data such as a USB connection or HDMI connection, the projector 10 can transmit control data to the document camera 50 to control the document camera 50. As a result, the user can control the operation of the document camera 50 by operating the projector 10, which has an advantage of improving usability. Further, the projector 10 and the document camera 50 are not limited to the configuration in which they are connected by wire, and may be connected by a wireless communication line such as a wireless LAN (including WiFi (registered trademark)) or Bluetooth (registered trademark).

In the projector 10, the optical modulator that modulates the light emitted by the light source is not limited to a configuration using a transmissive liquid crystal panel, for example, a configuration using a reflective liquid crystal panel or a configuration using a digital mirror device (DMD). It may be.
Further, the device to which the document camera 50 is connected is not limited to the projector 10, and for example, the document camera 50 may be connected to a display device that displays an image based on the captured image data captured by the document camera 50. .. In this case, the document camera 50 may be connected to a monitor device or a television receiver that displays an image on a liquid crystal display panel, a PDP (plasma display panel), an organic EL display panel, or the like. Further, the document camera 50 may be connected to a recording device that records the image data output by the document camera 50.

Further, the functional block shown in FIG. 2 shows the functional configuration of the projector 10 and the document camera 50, and does not limit a specific mounting form. That is, it is not necessary to implement the hardware corresponding to the functional blocks in the figure, and it is of course possible to realize the functions of a plurality of functional parts by executing a program by one processor. Further, a part of the functions realized by the software in the above embodiment may be realized by the hardware, or a part of the functions realized by the hardware may be realized by the software. In addition, the specific detailed configuration of each other part of the device constituting the projection system 100 can be arbitrarily changed without departing from the spirit of the present invention.

10 ... Projector (external device), 20 ... Control unit, 22 ... Storage unit, 24 ... Operation unit, 26 ... USB interface unit, 28 ... Input interface unit, 30 ... Input source switching unit, 31 ... Operation panel, 32 ... Image processing unit, 34 ... Projector unit, 36 ... Bus, 38 ... Remote control, 50 ... Document camera (electronic device, imaging device), 54 ... Mounting surface, 59 ... USB cable, 60 ... Operation panel, 66 ... Zoom operation unit (Operator), 70 ... Control unit (control unit, optical adjustment unit), 70a ... Zoom control unit, 70b ... Focus control unit, 72 ... Storage unit, 72b ... Setting data, 74 ... Operation unit (reception unit), 76 ... USB interface unit, 78 ... Illumination unit, 80 ... Illumination control unit, 84 ... Image processing unit (optical adjustment unit, drive unit), 86 ... Resolution conversion unit, 90 ... Imaging unit (optical unit), 91 ... Imaging lens ( Lens), 92 ... Imaging element, 93 ... Lens barrel, 94 ... Motor, 94a ... Gear, 95 ... Output circuit, 98 ... Lens operating unit, 100 ... Projection system, 201 ... Personal computer, 202 ... VTR, 203 ... DVD player , AX ... optical axis, SC ... screen, T ... subject.

Claims (9)

An optical unit that can move the lens in the optical axis direction by the operation of the motor,
A reception desk that accepts instructions for adjusting the lens position,
An optical adjustment unit that operates the motor to adjust the lens position of the optical unit in response to an instruction received by the reception unit is provided.
The reception unit is configured to be able to detect an operation on the operator, detects the start of the instruction when the operation of the operator is started, and detects the end of the instruction when the operation of the operator is released. And
The optical adjustment unit
The receiving unit is the duration of the accepts instructions or less set period, and, from the position at which the case of detecting the completion of the instruction, the operation of the operation element after release, the operation of the operator is started Perform the first adjustment operation to drive the motor by a predetermined amount,
Exceeds the setting period the duration of an instruction which the receiving unit receives, and, if not detected the end of the instruction, the upper limit of the operating range of the motor from the position at which the operation of the operator is started Alternatively, a second adjustment operation for driving the motor to the position of the target value corresponding to the lower limit is started, and the operation is started.
When the instruction received by the reception unit is completed after the second adjustment operation is started, the motor is stopped.
An electronic device characterized by. When the instruction received by the reception unit is completed after the second adjustment operation is started, the optical adjustment unit stops the motor even if the operation amount of the motor does not reach the target value.
The electronic device according to claim 1. The optical adjustment unit starts the second adjustment operation when the duration of the instruction exceeds the set period even before the instruction received by the reception unit is completed.
2. The electronic device according to claim 2. The optical adjustment unit sets a target value for the operation of the motor, and drives the motor based on the set target value.
When executing the first adjustment operation, a target value corresponding to the predetermined amount is set for each instruction received by the reception unit, and when executing the second adjustment operation, the upper limit of the operating range of the motor or Setting a target value corresponding to the lower limit,
The electronic device according to any one of claims 1 to 3. The optical adjusting unit drives the motor according to an operation pattern including an acceleration operation for accelerating the motor and a deceleration operation for decelerating the motor.
In the first adjustment operation, the motor is made to perform an operation including the deceleration operation according to the operation pattern matching the set target value.
In the second adjustment operation, the deceleration operation of the motor is executed after the instruction received by the reception unit is completed.
4. The electronic device according to claim 4. The motor is composed of a stepping motor.
The optical adjustment unit includes a control unit that sets the target value and a drive unit that outputs a drive signal to the stepping motor based on the target value set by the control unit.
The electronic device according to claim 4 or 5. The reception unit detects the instruction when an instruction signal is input from an external device, and receives the instruction.
It is determined that the instruction continues while the instruction signal is continuously input from the external device or at a cycle of every predetermined time, and the input of the instruction signal is interrupted beyond the predetermined time. If the end of the instruction is detected,
The electronic device according to any one of claims 1 to 6 . It is configured as an image pickup device including an image pickup element that receives light transmitted through the optical unit.
Adjusting the imaging state of the image sensor by adjusting the lens position with the optical adjustment unit.
The electronic device according to any one of claims 1 to 7 . It controls an electronic device that includes an optical unit that can move the lens in the optical axis direction by the operation of a motor, and a reception unit that is configured to detect operations on the operator and accepts instructions for adjusting the lens position .
When the operation of the operator is started, the reception unit detects the start of the instruction and detects the start of the instruction.
When the operation of the operator is released, the reception unit detects the end of the instruction and detects the end of the instruction.
In response to the instruction received by the reception unit, the motor is operated to adjust the lens position of the optical unit.
The receiving unit is the duration of the accepts instructions or less set period, and, from the position at which the case of detecting the completion of the instruction, the operation of the operation element after release, the operation of the operator is started Perform the first adjustment operation to drive the motor by a predetermined amount,
Exceeds the setting period the duration of an instruction which the receiving unit receives, and, if not detected the end of the instruction, the upper limit of the operating range of the motor from the position at which the operation of the operator is started Alternatively, a second adjustment operation for driving the motor to the position of the target value corresponding to the lower limit is started, and the operation is started.
When the instruction received by the reception unit is completed after the second adjustment operation is started, the motor is stopped.
A method of controlling an electronic device, which comprises.

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