Patent Document

FIELD OF THE INVENTION 
   The present invention relates to a camera which senses and records an image, and more particularly, to a camera having a collapsible lens which constitutes an optical system, and a control method therefor. 
   BACKGROUND OF THE INVENTION 
   Some cameras which adopt a collapsible lens automatically perform lens extension operation synchronized with power-on of the camera or lens storage operation synchronized with power-off of the camera. Some digital cameras capable of reproducing a sensed image in the camera main body automatically perform lens extension operation synchronized with a photographing mode or lens storage operation synchronized with a reproduction mode. 
   Automatic lens extension and storage by a camera provide a merit of saving the user&#39;s labor. However, the lens is extended/stored every time the camera is powered on/off or switched between the photographing mode and the reproduction mode. The user must wait for the completion of such operation for the time taken for the operation. 
   Cameras having a conversion lens and marine pack mounted outside the camera similarly execute lens extension and storage though the lens need not be stored. Lens extension and storage operations consume power necessary to drive the lens, wasting the battery. 
   SUMMARY OF THE INVENTION 
   The present invention has been made in consideration of the above situation, and has as its object to provide a camera which properly, effectively controls lens collapsing operation and is excellent in usability and the like, and a control method therefor. 
   To solve the above-described problem and achieve the above object, according to the first aspect of the present invention, an apparatus comprises (A) a switching device which switches a state of the apparatus; and (B) a control device which drives and controls a photographing optical system between a move-out state and a move-in state in response to switching of the switching device, wherein the control device can select different driving control modes with respect to the same switching by the switching device. 
   According to the second aspect of the present invention, an apparatus comprises (A) a switching device which switches a state of the apparatus, and (B) a control device which drives and controls a photographing optical system between an extension state and a storage state in response to switching of the switching device, wherein the control device can select different driving control modes with respect to the same switching by the switching device. 
   According to the third aspect of the present invention, a method of driving and controlling a photographing optical system comprises: driving and controlling the photographing optical system between a move-out state and a move-in state in response to state switching of an apparatus on which the photographing optical system is mounted, and enabling selecting different driving control modes with respect to the same state switching of the apparatus. 
   According to the fourth aspect of the present invention, a method of driving and controlling a photographing optical system comprises: driving and controlling the photographing optical system between an extension state and a storage state in response to state switching of an apparatus on which the photographing optical system is mounted, and enabling selecting different driving control modes with respect to the same state switching of the apparatus. 
   According to the fifth aspect of the present invention, a computer program of driving and controlling a photographing optical system comprises: driving and controlling the photographing optical system between a move-out state and a move-in state in response to state switching of an apparatus on which the photographing optical system is mounted, and enabling selecting different driving control modes with respect to the same state switching of the apparatus. 
   According to the sixth aspect of the present invention, a storage medium stores the driving control computer program. 
   According to the seventh aspect of the present invention, a computer program of driving and controlling a photographing optical system comprises: driving and controlling the photographing optical system between an extension state and a storage state in response to state switching of an apparatus on which the photographing optical system is mounted, and enabling selecting different driving control modes with respect to the same state switching of the apparatus. 
   According to the eighth aspect of the present invention, a storage medium stores the driving control computer program. 
   Other features and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1A  is a view showing a lens extension state when a camera according to an embodiment of the present invention is viewed from the lens; 
       FIG. 1B  is a view showing a lens storage state when the camera is viewed from the lens; 
       FIG. 1C  is a view when the camera is viewed from the finder; 
       FIG. 2A  is a view before a conversion lens is mounted when the lens-extended camera according to the embodiment of the present invention is viewed from the side; 
       FIG. 2B  is a view after the conversion lens is mounted when the lens-extended camera is viewed from the side; 
       FIG. 3  is a block diagram showing an arrangement according to the embodiment of the present invention; 
       FIG. 4  is a flow chart showing power-on operation according to the embodiment of the present invention; and 
       FIG. 5  is a flow chart showing power-off operation according to the embodiment of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   A camera and control method therefor according to a preferred embodiment of the present invention will be described below with reference to the accompanying drawings. 
     FIGS. 1A to 1C ,  2 A, and  2 B are views showing the outer appearance of a camera according to the embodiment of the present invention.  FIG. 1A  shows a state wherein a collapsible lens is extended.  FIG. 1B  shows a state wherein the collapsible lens is stored.  FIG. 1C  is a state wherein the camera is viewed from the, finder side.  FIG. 2A  shows a state wherein an adaptor such as a conversion lens is to be mounted on the camera main body while the collapsible lens is extended.  FIG. 2B  shows a state wherein the conversion lens is mounted on the camera main body. 
   In  FIG. 1 , reference numeral  500  denotes a camera main body. The camera main body  500  comprises a shutter button  502 , power ON/OFF switch  504 , mode dial switch  506 , adaptor detection switch  510 , collapsible lens  508 , display device  520 , and menu selection key  521 . 
   Reference numeral  600  denotes a conversion lens. The conversion lens  600  comprises a lens  602 , and a push pin  604  against the adaptor detection switch  510  of the system controller  50 . When the conversion lens  600  is mounted, the push pin  604  pushes the adaptor detection switch  510 . 
   As is apparent from  FIG. 2B , when the conversion lens  600  is mounted, it completely covers the collapsible lens  508  of the camera. The mounted conversion lens  600  stores the collapsible lens  508 , and the camera loses its compactness. That is, storage of the collapsible lens  508  and the compactness of the camera are irrelevant to each other. 
     FIG. 3  is a block diagram showing the internal block arrangement of a digital camera system according to the embodiment of the present invention. 
   In  FIG. 3 , reference numeral  100  denotes an image processing apparatus;  10 , a photographing lens;  12 , a shutter having a stop function;  14 , an image sensing element which converts an optical image into an electrical signal;  16 , an A/D converter which converts an analog signal output from the image sensing element  14  into a digital signal; and  18 , a timing generator which supplies a clock signal and control signal to the image sensing element  14 , the A/D converter  16 , and a D/A converter  26  under the control of a memory controller  22  and system controller  50 . 
   Reference numeral  20  denotes an image processor which performs predetermined pixel interpolation processing and color conversion processing on data from the A/D converter  16  or data from the memory controller  22 . The image processor  20  also performs predetermined calculation processing using sensed image data. The system controller  50  performs TTL (Through-The-Lens) AF (Auto Focus) processing, AE (Auto Exposure) processing, and EF (pre-flash) processing with respect to an exposure control means  40  and distance measurement control means  42  on the basis of the obtained calculation result. Further, the image processor  20  performs predetermined calculation processing using sensed image data, and performs TTL AWB (Auto White Balance) processing on the basis of the calculation result. 
   The memory controller  22  controls the A/D converter  16 , the timing generator  18 , the image processor  20 , an image display memory  24 , the D/A converter  26 , a memory  30 , and a compression/expansion circuit  32 . Data from the A/D converter  16  is written into the image display memory  24  or memory  30  via the image processor  20  and memory controller  22 , or directly via the memory controller  22 . Reference numeral  24  denotes the image display memory;  26 , the D/A converter; and  28 , an image display unit comprised of a TFT LCD or the like. Display image data written in the image display memory  24  is displayed on the image display unit  28  via the D/A converter  26 . An electronic finder function can be realized by sequentially displaying sensed image data on the image display unit  28 . The image display unit  28  arbitrarily turns on/off its display in accordance with an instruction from the system controller  50 . If the display is turned off, the electric consumption of the image processing apparatus  100  can be greatly reduced. 
   The memory  30 , used for storing photographed still and moving images, has a sufficient storage capacity for storing a predetermined number of still images and a moving image for a predetermined period. In sequential shooting to sequentially shoot a plurality of still images or in panoramic photographing, a large number of images can be written into the memory  30  at a high speed. The memory  30  can be used as a work area for the system controller  50 . 
   The compression/expansion circuit  32  compresses or expands image data by adaptive discrete cosine transformation (ADCT) or the like. The compression/expansion circuit  32  reads out an image stored in the memory  30 , performs compression or expansion processing on the read image, and writes the processed data into the memory  30 . 
   The exposure control means  40  controls the shutter  12  having a stop function, and also has a flash dimming function in cooperation with a flash  48 . The distance measurement control means  42  controls focusing of the photographing lens  10 . Reference numeral  44  denotes a zoom control means which controls zooming of the photographing lens  10 ; and  46 , a barrier control means which controls the operation of a protection means  102  serving as a barrier for the photographing lens  10 . The flash  48  has an AF auxiliary light projection function and flash adjusting function. The exposure control means  40  and distance measurement control means  42  are controlled by the TTL method. The system controller  50  controls the exposure control means  40  and distance measurement control means  42  on the basis of the calculation result of calculating sensed image data by the image processor  20 . 
   The system controller  50  controls the overall image processing apparatus  100 . Reference numeral  52  denotes a memory which stores constants, variables, programs, and the like for operating the system controller  50 . Reference numeral  54  denotes a display unit including a liquid crystal display device and loudspeaker which display and output operating statuses, messages, and the like by using characters, images, sound, and the like in accordance with execution of a program by the system controller  50 . One or a plurality of display units  54  are arranged at easy-to-see positions near the operation unit of the image processing apparatus  100 . Each display unit  54  includes a combination of an LCD, LED, sound generating element, and the like. Some functions of the display unit  54  are provided within an optical finder  104 . 
   The display contents of the display unit  54 , displayed on the LCD or the like, include indication of single-shot/sequential shooting, a self timer, a compression ratio, the number of recording pixels, the number of recorded images, the number of recordable images, a shutter speed, an f-number, exposure compensation, flash illumination, pink-eye effect mitigation, macro photographing, a buzzer-set state, a remaining timer battery level, a remaining battery level, an error state, information of plural digit numbers, the attached/detached status of recording media  200  and  210 , the operation of a communication I/F, and date and time. The display contents of the display unit  54 , displayed within the optical finder  104 , include a focus state, a camera shake warning, a flash charge state, a shutter speed, an f-number, and exposure compensation. 
   Reference numeral  56  denotes an electrically erasable and recordable nonvolatile memory which is typically an EEPROM. 
   Reference numerals  60 ,  62 ,  64 ,  66 ,  68 , and  70  denote operation means used to input various operation instructions to the system controller  50 . These operation means  60 ,  62 ,  64 ,  66 ,  68 , and  70  comprise one or a plurality of combinations of switches, dials, touch panels, and the like. These operation means will be described in detail. The mode dial switch  60  corresponds to the mode dial switch  506  shown in  FIG. 1A . The mode dial switch  60  allows switching and setting function modes such as an automatic photographing mode, a photographing mode, a panoramic photographing mode, a reproduction mode, a multi-image reproduction/erase button, and PC connection mode. 
   The power switch  68  corresponds to the power ON/OFF switch  504  shown in  FIG. 1A , and allows switching the power-on/off state of the camera. 
   The shutter switch SW 1   62  corresponds to the shutter button  502  shown in  FIG. 1A . The shutter switch SW 1   62  is turned on by half stroke of the shutter button (not shown) to designate the start of the operations of AF (Auto Focus) processing, AE (Auto Exposure) processing, AWB (Auto White Balance) processing, and EF (pre-flash) processing. 
   The shutter switch SW 2   64  is turned on by full stroke of the shutter button (not shown) to designate the start of a series of processing operations including exposure processing to write a signal read from the image sensing element  14  into the memory  30  via the A/D converter  16  and memory controller  22 , development processing by using calculations by the image processor  20  and memory controller  22 , and recording processing to read out image data from the memory  30 , compress the image data by the compression/expansion circuit  32 , and write the image data into the recording medium  200  or  210 . 
   The adaptor detection switch  66  corresponds to the adaptor detection switch  510  shown in  FIG. 1A , and detects attachment of the conversion lens  600  or the like. The detection result of the adaptor detection switch  66  is used to control lens collapsing operation by the system controller  50 . When the adaptor detection switch  66  detects that the conversion lens  600  is mounted, the system controller  50  determines not to store the lens. 
   The operation unit  70  comprises various buttons and touch panels corresponding to the display device  520  and menu selection key  521  shown in  FIG. 1C . The operation unit  70  includes a menu button, a set button, a macro button, a multi-image reproduction/repaging button, a flash set button, a single-shot/sequential shooting/self-timer switching button, a forward (+) menu item selection button, a backward (−) menu item selection button, a forward (+) reproduction image search button, a backward (−) reproduction image search button, a photographing quality selection button, an exposure correction button, and a date/time set button. 
   The operation unit  70  has a designation function of designating a lens collapsing control method. The collapsible lens can be driven and controlled in accordance with a collapsing control method designated by the designation function. The collapsing control method includes “auto mode” and “always lens extension mode”. In the auto mode, lens extension and collapsing operations are automatically executed in synchronism with the mode dial switch  60 , power switch  68 , and adaptor detection switch  66 . When the power switch  68  is turned off and the conversion lens  600  is mounted, it is automatically determined not to store the lens. 
   Reference numeral  80  denotes a power control means which comprises a battery detection circuit, a DC/DC converter, a switch circuit to switch a block to be energized, and the like. The power control means  80  detects the attached/detached state of the battery, a battery type, and a remaining battery power level. The power control means  80  controls the DC/DC converter based on detection results and an instruction from the system controller  50 , and supplies a necessary voltage to respective parts including a recording medium for a necessary period. Reference numerals  82  and  84  denote connectors; and  86 , a power source means including a primary battery such as an alkaline battery or lithium battery, a secondary battery such as an NiCd battery, NiMH battery, or Li battery, an AC adaptor, and the like. 
   Reference numerals  90  and  94  denote interfaces for recording media such as a memory card and hard disk;  92  and  96 , connectors which connect the image processing apparatus  100  and recording media such as a memory card and hard disk; and  98 , a recording medium attached/detached state detection means which detects whether the recording medium  200  or  210  is attached to the connector  92  or  96 . 
   In this embodiment, two systems of interfaces and connectors for connection with the recording medium are employed. However, one or a plurality of systems of interfaces and connectors for connection with recording medium may be provided. Further, interfaces and connectors pursuant to different standards may be combined. As the interfaces and connectors, cards in conformity with PCMCIA card standards and cards in conformity with CF (Compact Flash®) card standards may be used. In a case where cards and connectors in conformity with the PCMCIA standards, CF (Compact Flash®) card standards, and the like are used as the interfaces  90  and  94  and the connectors  92  and  96 , image data and management information attached to the image data can be transferred between the image processing apparatus and other peripheral devices such as a computer and printer by connecting various communication cards such as a LAN card, modem card, USB card, IEEE 1394 card, P1284 card, SCSI card, and PHS card. 
   The protection means  102  is a barrier which prevents contamination and damage of an image sensing portion by covering the image sensing portion including the lens  10  of the image processing apparatus  100 . The optical finder  104  allows photographing an image by using only the optical finder without using any electronic finder function on the image display unit  28 . The optical finder  104  displays some functions of the display unit  54  such as a focus state, a camera shake warning, a flash charge state, a shutter speed, an f-number, and exposure compensation. 
   Reference numeral  110  denotes a communication means having various communication functions for RS232C, USB, IEEE 1394, P1284, SCSI, modem, LAN, and wireless communication; and  112 , a connector/antenna which functions as a connector when the image processing apparatus  100  is connected to another device via the communication means  110 , and as an antenna for wireless communication. 
   The recording medium  200  comprises a memory card, hard disk, or the like. The recording medium  200  has a recording unit  202  of a semiconductor memory, magnetic disk, or the like, an interface  204  for the image processing apparatus  100 , and a connector  206  for connection with the image processing apparatus  100 . Also, the recording medium  210  comprises a memory card, hard disk, or the like. The recording medium  210  has a recording unit  212  of a semiconductor memory, magnetic disk, or the like, an interface  214  for the image processing apparatus  100 , and a connector  216  for connection with the image processing apparatus  100 . 
   Operation in this embodiment will be explained with reference to  FIGS. 4 and 5 . 
     FIG. 4  is an activation flow chart after the power switch of the camera is turned on. The power switch  68  is turned on, and the power switch ON flow starts (step S 401 ). Hardware and software necessary for the camera system are initialized (step S 402 ). Which mode is used to activate the camera is determined by checking the state of the mode dial  60  (step S 403 ). 
   In this case, which of the photographing and reproduction modes is set is determined, and corresponding processing is executed. To activate the camera in the photographing mode, the lens must be extended for photographing. Thus, whether the lens position is a photographing enable position is checked (step S 404 ). If the lens position is determined as a photographing disable position, the lens is driven to the photographing enable position (step S 405 ). After lens driving, the lens position is checked again, and the lens is repetitively driven until it reaches a photographing enable lens position. If the lens reaches a photographing enable lens position, hardware and software necessary for photographing are initialized (step S 406 ), and the camera changes to a photographing enable state. 
     FIG. 5  is a shut-down flow chart after the power switch of the camera is turned off. 
   The power switch  68  is turned off, and the power switch OFF flow starts (step S 501 ). A collapsing control method designated by the operation unit  70  is checked, and corresponding processing is executed depending on which of the auto mode and always lens extension mode is set. If the camera is set in the always lens extension mode, the lens need not be stored, camera system power-off processing is performed (step S 506 ), and the camera is powered off (step S 507 ). 
   If the camera is set in the auto mode, whether the conversion lens  600  or the like is mounted on the camera is checked by the adaptor detection switch  66  (step S 503 ) If mounting of the conversion lens  600  or the like is detected, the lens need not be stored, camera system power-off processing is performed (step S 506 ), and the camera is powered off (step S 507 ). 
   If no conversion lens or the like is mounted, lens storage processing is done. The lens position is checked, and whether the lens is at a storage position is determined (step S 504 ). If the lens is not at the storage position, the lens is driven toward the storage position (step S 505 ). Lens position check and lens driving are repeated until the lens reaches the storage position. If it is confirmed that the lens has moved to the storage position, camera system power-off processing is performed (step S 506 ), and the camera is powered off (step S 507 ). 
   In this fashion, when the always lens extension mode is selected by the operation unit  70 , or the conversion lens  600  or the like is mounted, no lens storage operation is executed in power-off processing. This greatly shortens the time until the camera is actually powered off after the power switch is turned off. In the next power-on processing, the lens has already been extended at the photographing enable position. This greatly shortens the time until the camera becomes a photographing enable state after the power switch is turned on. At the same time, no lens collapsing operation is performed upon power-on/off, reducing power consumption. 
   In the above embodiment, the conversion lens  600  is mounted on the camera, as shown in  FIGS. 2A and 2B . The present invention is not limited to the conversion lens, and can be applied to a case where a marine pack is mounted in the use of the camera under water. The same effects as those in mounting the conversion lens can be obtained as long as the mounted marine pack pushes the adaptor detection switch  510  in  FIG. 2A . 
   In the above embodiment, whether to store the lens can be selected upon switching the power source from ON to OFF. The present invention is not limited to this, and can be applied to a case where whether to extend the lens can be selected upon switching the power source from OFF to ON, whether to store the lens can be selected upon switching not the power source but another camera state from, e.g., the photographing mode to the reproduction mode, or whether to extend the lens can be selected upon switching the camera state from the reproduction mode to the photographing mode. 
   The embodiment has exemplified particularly a digital camera. The present invention can also be effectively applied to a silver halide camera, and the same effects as those of the above embodiment can be obtained. 
   Function blocks and processing sequences described in the embodiment may be realized by hardware or by a microcomputer system including a CPU or MPU, ROM, RAM, and the like while realizing the operation in accordance with a work program stored in the ROM or RAM. The present invention is also achieved when a software program for realizing a function is supplied to the RAM so as to realize the function of each function block and the function block operates in accordance with the program. 
   In this case, the software program realizes the functions of the above-described embodiment. The program, and a means for supplying the program to a computer, e.g., a storage medium which stores the program constitute the present invention. The storage medium which stores the program includes a flexible disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-I, CD-R, CD-RW, DVD, zip, magnetic tape, and nonvolatile memory card, in addition to a ROM and RAM. 
   The functions of the above-described embodiment are realized when the computer executes the supplied program. Also, the functions of the above-described embodiment are realized when the program is executed in cooperation with an OS (Operating System) or another application software running on the computer. 
   The functions of the above-described embodiment are also realized when the supplied program is stored in the memory of the function expansion board of the computer or the memory of a function expansion unit connected to the computer, and the CPU of the function expansion board or function expansion unit performs part or all of actual processing on the basis of the instructions of the program. 
   As has been described above, in the present invention, the user can select not to perform collapsible lens storage operation upon power-off. The activation time is shortened in the next power-on, realizing high-speed camera activation. The user hardly misses a good photographing opportunity. The absence of collapsible lens driving reduces power consumption, the battery duration is prolonged, and the camera can take many pictures for a long time. 
   As many apparently widely different embodiments of the present invention can be made without departing from the spirit and scope thereof, it is to be understood that the invention is not limited to the specific embodiments thereof except as defined in the appended claims.

Technology Category: 5