JP2005101729A - Digital camera with zooming function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform high-image quality zooming having a simple configuration, in a digital camera with a zooming function. <P>SOLUTION: The camera 15 of a cellular phone 10 with a camera is provided with a retraction-detecting sensor 43 and an insertion-detecting sensor 44 for detecting inserting/detaching of a bifocal photographic lens 16, an electronic zooming processor 51a, and a conversion lens 42. If the total zooming magnification factor reaches the inserting/detaching point by zooming the camera toward the telescope side, the output signal of the sensor 43 turns from "H" to "L", a freezed image photographed immediately, before is read from a frame memory 52, and the read image is displayed as a through image on an LCD 20. The output signal of the sensor 44 turns from "L" to "H", immediately after the completion of inserting the conversion lens 42, the display of the freezed image is stopped, and a new photographed image is displayed on the LCD 20. In this way, disturbance of a display image at the insertion/detaching point can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a digital camera with a zoom function mounted on a small electronic device such as a mobile phone.

  Recently, many mobile phones with digital cameras are on the market. Many of the digital cameras built in this mobile phone have a zoom function. This zoom function includes an optical zoom using a zoom lens (Patent Document 1) and an electronic zoom. As is well known, the electronic zoom is a method in which an image obtained by a solid-state imaging device such as a CMOS image sensor is electronically enlarged to perform pseudo zooming. Optical zoom requires a mechanical configuration that precisely moves multiple lenses and is expensive, while electronic zoom does not require a mechanical configuration and is low cost. This electronic zoom is adopted.

  On the other hand, a video camera is known in which the imaging magnification can be continuously switched by a combination of a multifocal lens and an electronic zoom, similarly to a normal zoom lens (Patent Document 2). In this video camera, a memory for writing a video signal subjected to image enlargement processing with an electronic zoom is provided, and when switching the optical magnification in the multifocal lens, the video signal for the previous one screen is repeatedly read out from the memory and output, This prevents the display image from being affected by the change of the optical magnification (the display image is disturbed).

JP 2002-262164 A JP-A-8-18842

  By the way, digital cameras for mobile phones have also been improved in image quality, and the effective number of pixels of the image sensor, which was initially about 350,000 pixels, has become a megapixel class (1 million pixels or more). Optical zoom is advantageous to take advantage of such megapixel-class high image quality. However, since a digital camera for mobile phones must be ultra-compact, the zoom lens moving mechanism must be It is difficult to achieve high accuracy.

  Thus, as described in Patent Document 2, it can be considered that a multifocal lens and an electronic zoom are combined and applied to a digital camera for a mobile phone. In Patent Document 2, a specific configuration of the multifocal lens is considered. And details of the relationship between the change of optical magnification and the display or non-display of a frozen image in the memory are not described, and furthermore, a simpler configuration for application to a digital camera for a mobile phone Because there is a restriction that it must be, it was difficult to actually implement.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a digital camera with a zoom function for a mobile phone that can perform high-quality zooming with a simple configuration.

  In order to achieve the above object, a digital camera with a zoom function according to the present invention is inserted / removed between a master lens, an insertion position inserted on the optical axis of the master lens, and a retracted position retracted from the insertion position. A multifocal lens comprising a freely provided conversion lens, an optical magnification switching mechanism for switching the optical magnification by switching the focal length of the multifocal lens by inserting and removing the conversion lens, and the conversion lens inserted at the insertion position An insertion detecting device that detects the conversion lens retracted to the retracted position, an image sensor that photoelectrically converts a subject image formed by the multifocal lens to obtain a photographed image, and the photographing An electronic zoom processing unit that electronically enlarges a part of an image to perform electronic zoom processing, and the electronic zoom processing unit Accordingly, an image display device that displays the processed captured image, a memory that freezes the captured image when the electronic magnification by the electronic zoom processing unit reaches a predetermined value, and a memory that stores the frozen image, When the insertion detection device or the retraction detection device detects the movement of the conversion lens from the insertion position or the retraction position, the display of the new photographed image is stopped, the freeze image is displayed on the image display device, and the insertion detection is performed. Image display control for stopping display of the freeze image and displaying a newly captured image on the image display device from the time when the device or the retraction detection device detects the return to the insertion position or retraction position of the conversion lens And a portion.

  Also, a multifocal lens that performs optical focus switching by selecting one of a plurality of photographing lenses having different focal lengths and inserting the selected one on the photographing optical axis, and switching the focal length of the multifocal lens. An optical magnification switching mechanism for switching the optical magnification, an insertion detection device for detecting one photographing lens inserted on the photographing optical axis, and a subject image formed by the multifocal lens by photoelectric conversion and photographing. An image pickup device that obtains an image, an electronic zoom processing unit that electronically enlarges a part of the captured image to perform electronic zoom processing, an image display device that displays the captured image processed by the electronic zoom processing unit, The image captured when the electronic magnification by the electronic zoom processing unit reaches a predetermined value is frozen, a memory for storing the frozen image, and the insertion detecting device is a photographic lens. When the movement from the photographing optical axis is detected, the display of a new photographed image is stopped, the freeze image is displayed on the image display device, and the insertion detection device inserts the photographing lens onto the photographing optical axis. And an image display control unit for stopping the display of the freeze image and displaying the newly captured image on the image display device.

  Further, the multifocal lens is displaced between a self-portrait position facing the same side as the display surface of the image display device and a self-portrait position facing the opposite side of the display surface of the image display device. It is characterized by being free.

  Also, a photographic lens that is composed of a plurality of lenses, and is provided so as to be detachable between an insertion position at which some of the specific lenses are inserted on the optical axis and a retraction position that is retracted from the optical axis. , An optical magnification switching mechanism for switching the focal length of the photographing lens by inserting and removing the specific lens to switch the optical magnification, an insertion detection device for detecting the specific lens inserted at the insertion position, and the identification retracted to the retraction position A retract detection device that detects a lens, an image sensor that photoelectrically converts a subject image formed by the multifocal lens to obtain a captured image, and electronic zoom processing by electronically enlarging a part of the captured image An electronic zoom processing unit to be performed, an image display device for displaying a photographed image processed by the electronic zoom processing unit, and a time when an electronic enlargement magnification by the electronic zoom processing unit reaches a predetermined value Freezes the captured image, and stops displaying a new captured image when the memory for storing the frozen image and the insertion detection device or the retraction detection device detect the movement of the specific lens from the insertion position or the retraction position. Then, the freeze image is displayed on the image display device, and when the insertion detection device or the retraction detection device detects the return to the insertion position or retraction position of the specific lens, the display of the freeze image is stopped, An image display control unit for displaying a newly captured image on an image display device is provided.

  According to the digital camera with a zoom function of the present invention, when the insertion detection device or the retraction detection device detects the movement of the conversion lens from the insertion position or the retraction position, the display of a new captured image is stopped and a freeze image is displayed. Displayed on the image display device, and when the insertion detection device or retraction detection device detects the return of the conversion lens to the insertion position or retraction position, the freeze image display is stopped and the newly captured image is displayed. Since the image is displayed on the apparatus, high-quality zooming can be performed with a simple configuration.

  Further, as the multifocal lens, any one of a plurality of photographing lenses having different focal lengths may be selected and inserted on the photographing optical axis. Further, since the multifocal lens is freely displaceable between the self-portrait position and the other-person shooting position, it is possible to enjoy various shootings in various scenes. For example, when it is used as a camera of a camera-equipped mobile phone, the camera-equipped mobile phone can be used as a videophone if the camera is in a self-portrait position. Further, the photographic lens may be composed of a plurality of lenses, and a part of the specific lenses may be detachably provided on the optical axis to change the optical magnification.

  In FIG. 1, a camera-equipped mobile phone 10 that is an embodiment equipped with a digital camera with a zoom function according to the present invention includes an upper body 11 and a lower body 12, which can be rotated via a hinge portion 13. Are combined. A cylindrical digital camera (hereinafter referred to as a camera) 15 is provided so as to be sandwiched between a pair of leg portions 13 a and 13 b of the hinge portion 13.

  The camera 15 is rotatable about the axis of the hinge portion 13. When the photographing lens 16 is directed outward, another person such as a friend is photographed. It becomes convenient for. Note that a plurality of finger hooking grooves are formed on the peripheral surface of the camera 15 in parallel with the axial direction so that the camera 15 can be easily rotated.

  The hinge portion 13 is provided with a click mechanism (not shown) so that the upper main body 11 and the lower main body 12 are locked at a predetermined angle shown in the figure when the camera-equipped mobile phone 10 is used. . When the camera-equipped mobile phone 10 is not used, the upper body 11 and the lower body 12 are folded so as to be parallel.

  An antenna 17 is housed behind the upper main body 11, and a reception speaker 18 and a liquid crystal display (LCD) 20 are provided on the front surface 11a. The lower body 12 is provided with an operation unit 24 including a transmission microphone 21, a selection key 22, a dial key 23, and the like. Further, the side surface of the lower main body 12 is provided with a socket 25 for cable connection with an external device such as a personal computer, and a memory card slot 26 into which a memory card 35 (see FIG. 2) is loaded.

  The antenna 17 is pulled out from the upper body 11 when using a telephone call, an e-mail service, or an Internet connection service, receives a radio signal from another mobile phone or an Internet server, and is transmitted from the camera-equipped mobile phone 10. Transmit the radio signal to the outside.

  The receiving speaker 18 outputs the voice (receiving voice) of the communication partner and the incoming melody. On the display screen 20a of the LCD 20, various menu screens, the telephone number and mail address of the called party, images downloaded from the Internet server, through images and photographed images output from the camera 15 are displayed.

  The transmission microphone 21 converts the voice of the speaker (transmission voice) into an electrical voice signal and transmits it to the call partner via the antenna 17. The selection key 22 is operated when selecting / setting various menus such as registration of a telephone number and mail address, using an Internet connection service or an e-mail service, and a multifunction key 22a having a zoom button function, shutter A button 22b is provided, and photographing by the camera 15 can be performed by these operations.

  In addition, the camera 15 can select a still image shooting mode for shooting still images, a movie shooting mode for shooting movies, a playback mode for displaying captured images on the display screen 20a of the LCD 20, and a setting mode for performing various settings. It has become. Switching between these modes is performed by operating the selection key 22. The dial key 23 is operated when inputting a telephone number, e-mail text, or the like.

  In FIG. 2 showing the electrical configuration of the camera-equipped mobile phone 10, the CPU 30 controls the overall operation of the camera-equipped mobile phone 10. In addition to the camera 15 and the operation unit 24, the CPU 30 performs audio processing such as noise removal on audio input / output from the reception speaker 18 and the transmission microphone 21 via the data bus 31. Wireless communication for transmitting / receiving radio wave signals via the processing circuit 33, LCD driver 34 for controlling display of the LCD 20, media controller 36 for controlling input / output of data to / from the memory card 35 via the memory card slot 26, and antenna 17. An external communication I / F 38 that transmits and receives data to and from an external device is connected via the I / F 37 and the socket 25.

  The camera 15 has a zoom function that uses a photographing lens 16 that is a bifocal lens and an electronic zoom. The photographing lens 16 includes a master lens 40 and a conversion lens 41 and is held by a lens barrel 39. The conversion lens 41 is provided movably between an insertion position (shown by a two-dot chain line) inserted on the photographing optical axis L of the master lens 40 and a retreat position (shown by a solid line) retreating from the insertion position. Then, it is inserted / removed by the conversion lens inserting / removing mechanism 42.

  Further, in the vicinity of the retracted position, the conversion lens 41 at the retracted position is detected and the output signal “H” is output, and when the conversion lens 41 cannot be detected at the retracted position, the output signal “L” is output. A retraction detection sensor 43 is provided. Further, in the vicinity of the insertion position, the conversion lens 41 at the insertion position is detected and the output signal “H” is output. When the conversion lens 41 cannot be detected at the insertion position, the output signal “L” is output. An insertion detection sensor 44 is provided.

  The conversion lens 41 is a teleconversion lens that increases the photographing magnification by inserting the conversion lens 41. The conversion lens 41 discontinuously changes the focal length by combining with the master lens 40, and the optical magnification is, for example, 1 × that of the master lens 40 (same magnification). ) And 3 times. In addition, the electronic zoom performs pseudo zooming without permission in the range from the same magnification to 3 times by electronic zoom processing described later. As a result, the total zoom magnification obtained by combining the electronic zoom magnification and the optical magnification becomes a stepless range in the range from the same magnification to 9 times that of the master lens 40.

  The master lens 40 is moved along the photographing optical axis L by the focusing mechanism 45 to perform focusing. The conversion lens insertion / removal mechanism 42 and the focusing mechanism 45 are each composed of a mechanical mechanism and a motor, and are controlled by the CPU 30 via the driver 46 and the data bus 31.

  A CCD 50 is disposed behind the taking lens 16. The CCD 50 photoelectrically converts subject light imaged by the photographing lens 16 and outputs it as an imaging signal. The signal processing circuit 51 performs sampling, amplification, and A / D conversion on the imaging signal output from the CCD 50, and outputs digital image data. Further, the signal processing circuit 51 has an electronic zoom processing unit 51a. The electronic zoom processing unit 51a performs electronic zoom processing that performs zooming in a pseudo manner by electronically enlarging a part of image data. The image data output from the signal processing circuit 51 is temporarily stored in the frame memory 52 via the data bus 31. The operation of the CCD 50 is controlled by a timing generator (not shown).

  The image data once stored in the frame memory 52 is displayed as a through image on the display screen 20a of the LCD 20 via the LCD driver 34. Alternatively, after shutter release, recording is performed on the memory card 35 via the media controller 36 and the memory card slot 26. In addition, a ROM 54, a zoom counter 55, and an LUT (Look Up Table Memory) 56 are connected to the data bus 31. The ROM 54 stores programs, various setting information, and the like.

  When the multifunction key 22a is operated to the telephoto (T) side, the zoom counter 55 counts up the counter value according to the operation amount, and the multifunction key 22a is operated to the wide angle (W) side. If so, count down in the same way. Based on the counter value, the CPU 30 specifies the total zoom magnification desired by the user (the combined magnification of the optical magnification and the electronic zoom magnification). The LUT 56 stores a correspondence relationship between the total zoom magnification, the optical magnification switching point of the photographing lens 16, and the electronic zoom magnification. The CPU 30 determines whether or not it is necessary to switch the optical magnification of the photographing lens 16 from the LUT 56 according to the specified total zoom magnification, and determines the electronic zoom magnification.

  At the point where the conversion lens 41 is inserted / removed, that is, during the optical magnification switching, the image formed on the CCD 50 arranged behind the taking lens 16 is disturbed and the display image on the LCD 20 is disturbed. Image data captured immediately before (hereinafter referred to as immediately preceding captured image data) is stored in the frame memory 52, and during the optical magnification switching, the immediately preceding captured image data is read from the frame memory 52 and displayed on the display screen 20a of the LCD 20. . After the optical magnification switching is completed, the display on the LCD 20 is performed based on the photographing data photographed through the photographing lens 16. Accordingly, the total zoom magnification can be continuously changed without the user feeling uncomfortable at the point where the conversion lens 41 is inserted and removed.

  The operation of the camera-equipped mobile phone 10 configured as described above will be described. When photographing using the camera 15, first, the upper main body 11 and the lower main body 12 are rotated via the hinge portion 12 to obtain the state shown in FIG. 1. Then, the selection key 22 is operated to switch the camera-equipped mobile phone 10 to the camera mode. Further, when it is desired to take a picture of myself or a friend including myself, the taking lens 16 of the camera 15 is directed to the same side as the display screen 20a of the LCD 20, as shown in FIG. When it is desired to photograph other people or scenery, the photographing lens 16 is directed to the opposite side of the display screen 20a of the LCD 20.

  The subject light transmitted through the photographing lens 16 is output from the CCD 50 as an imaging signal. The imaging signal output from the CCD 50 is subjected to sampling, amplification, A / D conversion, and electronic zoom processing by the signal processing circuit 51, and digital image data is output. The output image data is temporarily stored in the frame memory 52. The signal processing circuit 51 checks the contrast of the image data and detects the focal position. Then, the CPU 30 drives the focusing mechanism 45 via the driver 46 based on the detected focal position.

  The image data once stored in the frame memory 52 is read by the CPU 30 and subjected to various image processing such as gradation conversion, image composition, and encoding processing. The image data after image processing is displayed as a through image on the LCD 20 via the LCD driver 34. In this state, when the user alternately presses the left and right ends of the multifunction key 22a, the count value of the zoom counter 55 is counted up or down. The CPU 30 specifies the total zoom magnification from the count value, and performs switching of the conversion lens 41 and electronic zoom processing according to the total zoom magnification while referring to the LUT 56.

  In the graph of FIG. 3 showing the relationship between the total zoom magnification and the electronic zoom magnification stored in the LUT 56, when the camera-equipped mobile phone 10 is set to the camera mode, the camera 15 resets the zoom counter 55, Set the total zoom magnification to the wide end, which is the initial position. At the wide end, as shown in FIG. 2, the conversion lens 41 is in the retracted position and has the lowest optical magnification. Also, the electronic zoom magnification is equal. In this state, as shown in the time chart of FIG. 4, the output signal of the retraction detection sensor 43 is “H”, and the output signal of the insertion detection sensor 44 is “L”.

  When the multifunction key 22a is operated to the telephoto side, the total zoom magnification is up-counted according to the amount of operation, and enlargement zoom is performed. At this time, the through image of the LCD 20 is also enlarged. When enlargement zoom is performed from the wide end, first, the electronic zoom magnification is gradually enlarged. This enlargement electronic zoom process is performed until the insertion / removal point P of the conversion lens 41 at which the total zoom magnification becomes 3 times is reached. The photographed image is frozen at a freeze point Q of, for example, 2.9 times the total zoom magnification immediately before reaching the insertion / removal point P, and the image data of the freeze image is stored in the frame memory 52.

  When the total zoom magnification reaches the insertion / removal point P, when the conversion lens insertion / removal mechanism 42 starts driving, the output signal of the insertion detection sensor 44 remains “L”, but the output signal of the retraction detection sensor 43 is “ It changes from “H” to “L”. In response to this, the CPU 30 prohibits the display of the through image based on the captured image, and simultaneously reads the image data of the freeze image from the frame memory 52 and displays it on the LCD 20 as a through image.

  When the insertion of the conversion lens 41 is completed, the output signal of the retraction detection sensor 43 remains “L”, but the output signal of the insertion detection sensor 44 changes from “L” to “H”. In response to this, the CPU 30 stops displaying the freeze image and displays a through image based on the image data photographed through the photographing lens 16 on the LCD 20. This prevents the display image from being disturbed at the insertion / removal point P. Although the time required for inserting the conversion lens 41 varies depending on the mechanism, it is about 0.05 to 0.5 seconds. Since this period is a freeze screen, even when the user continues to watch the display on the LCD 20. There is little discomfort.

  By inserting the conversion lens 41, the optical magnification of the photographing lens 16 is tripled and at the same time the electronic zoom magnification is reset to the same magnification. Subsequently, when the user operates the multifunction key 22a to the telephoto side, the electronic zoom magnification is enlarged from the same magnification, and reaches the tele end where the total zoom magnification is 9 times.

  When the user operates the multifunction key 22a to the wide-angle side from the tele end, the total zoom magnification is down-counted according to the operation amount, and the reduction zoom is performed. First, the electronic zoom magnification is gradually reduced. In this state, the output signal of the retraction detection sensor 43 remains “L” and the output signal of the insertion detection sensor 44 remains “H”. The photographed image is frozen at a freeze point (not shown) of, for example, 3.1 times the total zoom magnification immediately before the total zoom magnification reaches the insertion / removal point P, and the image data of the freeze image is stored in the frame memory 52. The

  When the total zoom magnification reaches the insertion / removal point P, when the conversion lens 41 is retracted by the conversion lens insertion / removal mechanism 42, the output signal of the retraction detection sensor 43 remains “L” and the insertion detection sensor The output signal 44 changes from “H” to “L”. In response to this, the CPU 30 prohibits the display of the through image based on the captured image, and simultaneously reads the image data of the freeze image from the frame memory 52 and displays it on the LCD 20 as a through image.

  When the conversion lens 41 is retracted, the output signal of the insertion detection sensor 44 remains “L”, but the output signal of the retract detection sensor 43 changes from “L” to “H”. In response to this, the CPU 30 stops displaying the freeze image and displays a through image based on the image data photographed through the photographing lens 16 on the LCD 20. This prevents the display image from being disturbed at the insertion / removal point P. It should be noted that the time required for retracting the conversion lens 41 is about 0.05 to 0.5 seconds as in the case of the above-described insertion, and since this is the freeze screen, the user continues to watch the display on the LCD 20. Even in that case, there is little discomfort. When the total zoom magnification is further reduced, a reduction zoom process is performed to reach the wide end.

  Thus, since the through image is displayed on the LCD 20 with a total zoom magnification in the range of the same magnification to 9 times without any sense of incompatibility, the user can freely perform framing by observing the through image. When the shutter button 22b is pressed after the framing is completed, image data is recorded on the memory card 35 via the media controller 36 and the memory card slot 26 at an image magnification corresponding to the total zoom magnification.

  In the above embodiment, the photographing lens of the camera is composed of the master lens and the conversion lens. However, the present invention is not limited to this, and as shown in FIG. The photographing lens 62 may be composed of two first lenses 63 and second lenses 64 having different focal lengths. The first lens 63 and the second lens 64 are attached to the turret 65, and the turret 65 is rotated by the turret rotation mechanism 66, so that one of the first lens 63 and the second lens 64 is selected. First, it is inserted into the photographing optical axis L, and the focal length of the photographing lens 62 is changed.

  In the vicinity of the photographing optical axis L, an insertion detection sensor 68 that detects the lenses 63 and 64 inserted into the photographing optical axis L is provided. When one of the first lens 63 and the second lens 64 is inserted into the photographing optical axis L, the insertion detection sensor 68 has an output signal “H”, and the first detection sensor 68 is in the first state as the turret 65 is rotating. In a state where neither the lens 63 nor the second lens 64 is inserted into the photographing optical axis L, the output signal becomes “L”. If the output signal of the insertion detection sensor 68 is “H”, the CPU 30 displays the captured image on the LCD 20 as a through image, and displays the freeze image on the LCD 20 while the output signal of the insertion detection sensor 68 is “L”. To do. In this embodiment, the turret is provided with two lenses and the photographing lens is a bifocal lens. However, the turret may be provided with three lenses and a trifocal lens.

  In the embodiment described first, the photographing lens of the camera is a bifocal lens. However, the present invention is not limited to this. For example, two conversion lenses may be used and a trifocal lens may be used. Further, although the photographing lens is composed of two lenses, one master lens and one conversion lens, this lens configuration may be changed as appropriate. Further, the photographic lens may be a zoom lens composed of a plurality of lenses, and some of the constituent lenses may be detachable on the optical axis so that the optical magnification is discontinuously changed. In addition, although the optical magnification and the electronic zoom magnification are each three times, the present invention is of course not limited to this value. For example, the optical magnification may be 2 times and the electronic zoom magnification may be 4 times.

  In addition, although the freeze point when zooming from wide angle to telephoto is 2.9 times, the present invention is not limited to this, and may be 2.95 times or 2.8 times, for example. In addition, although the freeze point when zooming from telephoto to wide angle is 3.1 times, the present invention is not limited to this, and may be 3.05 times or 3.2 times, for example.

  The present invention is applicable not only to a camera-equipped mobile phone but also to a surveillance camera, for example.

1 is an external perspective view of a camera-equipped mobile phone according to an embodiment of the present invention. It is a block diagram which shows the electric constitution of the mobile phone with a camera. It is a graph which shows the relationship between an optical magnification, an electronic zoom magnification, and a total zoom magnification. It is a time chart at the time of zooming from a wide angle to a telephoto. It is a block diagram which shows the electric constitution of the mobile phone with a camera which is another embodiment.

Explanation of symbols

10 Mobile Phone with Camera 11 Upper Body 12 Lower Body 15 Camera 16, 62 Shooting Lens 20 LCD
22a Multi-function key 22b Shutter button 30 CPU
40 Master lens 41 Conversion lens 42 Conversion lens insertion / removal mechanism 43 Retraction detection sensor 44, 68 Insertion detection sensor 50 CCD
51 Signal Processing Circuit 51a Electronic Zoom Processing Unit 52 Frame Memory 55 Zoom Counter 56 LUT
63 first lens 64 second lens 65 turret 66 turret rotation mechanism

Claims (4)

A multifocal lens comprising a master lens and a conversion lens that is detachably provided between an insertion position inserted on the optical axis of the master lens and a retraction position retracted from the insertion position;
An optical magnification switching mechanism for switching the optical magnification by switching the focal length of the multifocal lens by inserting and removing the conversion lens;
An insertion detection device for detecting the conversion lens inserted at the insertion position;
A retract detection device for detecting the conversion lens retracted to the retract position;
An image sensor that photoelectrically converts a subject image formed by the multifocal lens to obtain a captured image;
An electronic zoom processing unit that electronically enlarges a part of the captured image and performs electronic zoom processing;
An image display device for displaying a photographed image processed by the electronic zoom processing unit;
A memory that freezes a captured image at a time when an electronic magnification by the electronic zoom processing unit reaches a predetermined value, and a memory that stores the frozen image;
From the time when the insertion detection device or the retraction detection device detects the movement of the conversion lens from the insertion position or the retraction position, the display of a new captured image is stopped, the freeze image is displayed on the image display device, and the insertion Image display in which the display of the freeze image is stopped and the newly captured image is displayed on the image display device from the time when the detection device or the retraction detection device detects the return to the insertion position or retraction position of the conversion lens. A digital camera with a zoom function, characterized in that a control unit is provided. A multifocal lens that performs optical focus switching by selecting any one of a plurality of photographing lenses having different focal lengths and inserting them on the photographing optical axis;
An optical magnification switching mechanism for switching the optical magnification by switching the focal length of the multifocal lens;
An insertion detecting device for detecting one photographing lens inserted on the photographing optical axis;
An image sensor that photoelectrically converts a subject image formed by the multifocal lens to obtain a captured image;
An electronic zoom processing unit that electronically enlarges a part of the captured image and performs electronic zoom processing;
An image display device for displaying a photographed image processed by the electronic zoom processing unit;
A memory that freezes a captured image at a time when an electronic magnification by the electronic zoom processing unit reaches a predetermined value, and a memory that stores the frozen image;
When the insertion detection device detects the movement of the photographic lens from the photographic optical axis, the display of a new photographic image is stopped and the freeze image is displayed on the image display device, and the insertion detection device displays the photographic lens. And an image display control unit for stopping the display of the freeze image and displaying a newly captured image on the image display device from the time when the insertion of the image on the imaging optical axis is detected. Digital camera with zoom function.   The multifocal lens is freely displaceable between a self-portrait position facing the same side as the display surface of the image display device and a self-portrait position facing the opposite side of the display surface of the image display device. 3. The digital camera with a zoom function according to claim 1, wherein the digital camera has a zoom function. A photographic lens that is composed of a plurality of lenses, among which a part of the specific lens is inserted between the insertion position where the lens is inserted on the optical axis and the retraction position where the lens is retracted from the optical axis;
An optical magnification switching mechanism for switching the optical magnification by inserting and removing the specific lens and switching the focal length of the photographing lens;
An insertion detection device for detecting a specific lens inserted in the insertion position;
A retract detection device for detecting the specific lens retracted to the retract position;
An image sensor that photoelectrically converts a subject image formed by the multifocal lens to obtain a captured image;
An electronic zoom processing unit that electronically enlarges a part of the captured image and performs electronic zoom processing;
An image display device for displaying a photographed image processed by the electronic zoom processing unit;
A memory that freezes a captured image at a time when an electronic magnification by the electronic zoom processing unit reaches a predetermined value, and a memory that stores the frozen image;
When the insertion detection device or the retraction detection device detects the movement of the specific lens from the insertion position or the retraction position, the display of a new captured image is stopped, the freeze image is displayed on the image display device, and the insertion Image display in which the display of the freeze image is stopped and the newly captured image is displayed on the image display device when the detection device or the retraction detection device detects the insertion of the specific lens or the return to the retraction position. A digital camera with a zoom function, characterized in that a control unit is provided.

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