JP4157465B2 - Zoom eyepiece and telescope - Google Patents

Description

  The present invention relates to a zoom eyepiece and a telescope.

  A telescope with a digital photographing function (ground telescope) capable of photographing an electronic image similar to an observation image viewed from an eyepiece is known (for example, see Patent Document 1). The telescope with a digital imaging function is configured to branch the light that has passed through the objective optical system and the focus lens with a beam splitter, guide one of the branched light to the eyepiece optical system, and guide the other light to an image sensor such as a CCD. Has been.

  In such a telescope with a digital photographing function, it is necessary for the user to understand the range of the photographing field on the image sensor with respect to the observation field of view observed from the eyepiece. For this reason, conventionally, a single-focus eyepiece is integrated into the telescope body, and a frame indicating the range of the photographing field is displayed when the eyepiece is viewed.

  However, the conventional configuration is inconvenient because the observation magnification with the eyepiece cannot be changed. There is also a problem that a frame indicating the field range displayed in the eyepiece hinders the field of view.

Registered Utility Model No. 3074642

  The object of the present invention is to zoom in and change the observation magnification in a telescope equipped with an image sensor, when the observation field of view becomes almost as wide as the range of the shooting field on the image sensor. It is an object of the present invention to provide a zoom eyepiece and a telescope that allow a user to easily and surely understand the above.

Such an object is achieved by the present inventions (1) to (8) below.
(1) A zoom eyepiece having an eyepiece optical system including a zoom optical system, and a zoom operation member operated when zooming the zoom optical system,
An objective optical system, an imaging element that captures a subject image formed via the objective optical system, a first optical path that goes to the eyepiece optical system, and a second optical path that goes to the imaging element via the optical path that has passed through the objective optical system It can be used by attaching to a telescope body equipped with a beam splitter that branches into
When the zoom operation member is operated, the zoom operation is performed when the range of the observation field of view observed through the eyepiece optical system is almost the same as the range of the photographing field on the image sensor. A zoom eyepiece characterized in that the feel of operating a member changes.

  Accordingly, when zooming and changing the observation magnification in a telescope equipped with an image pickup device, when the range of the observation field of view becomes almost the same as the range of the shooting field on the image pickup device, the user This can be easily and reliably known from the change in the feeling of operating the zoom operation member. Therefore, if the image is taken in that state, it is possible to take an image with a field that is almost as wide as the observation field of view, so that it is possible to reliably prevent a mistake in taking a picture by mistaking the image field.

(2) The zoom eyepiece according to (1), further including a click mechanism that causes the change in the touch.
Thereby, the said effect can be achieved with a simple structure.

  (3) The zoom eyepiece according to (1) or (2), further including a fixing unit capable of fixing a zooming position in a state where the range of the observation field of view is substantially the same as the range of the photographing field.

  As a result, if the zooming position is fixed while the range of the observation field of view is approximately the same as the range of the shooting field, the zooming position can be reliably maintained. Unintentional movement can be prevented, and it is possible to more reliably prevent mistakes in shooting due to misunderstanding of the range of the shooting field.

(4) The zoom eyepiece according to (3), wherein the fixing unit includes a meshing portion that meshes when the zoom operation member is moved in the optical axis direction and prohibits the operation of the zoom operation member.
Thereby, the zooming position fixing means can be configured with a simple structure.

  (5) The telescope main body further includes a focusing unit having a focus operating member that is operated when focusing and a focus lens that moves in an optical axis direction by the operation of the focus operating member, and the imaging element includes: The subject image formed through the objective optical system and the focus lens is picked up, and the beam splitter branches the optical path that passes through the objective optical system and the focus lens into the first optical path and the second optical path. The zoom eyepiece according to any one of (1) to (4) above.

  Thereby, it is possible to perform both the focus adjustment of the observation image observed through the eyepiece optical system and the captured image captured by the image sensor.

(6) an objective optical system;
A zoom eyepiece having an eyepiece optical system including a zoom optical system, and a zoom operation member operated when zooming the zoom optical system;
An image sensor that captures a subject image formed via the objective optical system;
A telescope comprising a beam splitter for branching an optical path passing through the objective optical system into a first optical path toward the eyepiece optical system and a second optical path toward the image sensor;
In the zoom eyepiece, when the zoom operation member is operated, the range of the observation field of view observed through the eyepiece optical system is substantially the same as the range of the shooting field on the image sensor. A telescope characterized in that the feel of operating the zoom operation member sometimes changes.

  Accordingly, when zooming and changing the observation magnification in a telescope equipped with an image pickup device, when the range of the observation field of view becomes almost the same as the range of the shooting field on the image pickup device, the user This can be easily and reliably known from the change in the feeling of operating the zoom operation member. Therefore, if the image is taken in that state, it is possible to take an image with a field that is almost as wide as the observation field of view, so that it is possible to reliably prevent a mistake in taking a picture by mistaking the image field.

  (7) The imaging optical system of the imaging element is configured by the entire optical system disposed between the objective optical system including the objective optical system and the light receiving surface of the imaging element, and the angle of view of the imaging optical system The telescope according to (6), wherein the angle is 3.5 degrees or less.

  The present invention can be particularly preferably applied to a telescope in which the angle of view of the imaging optical system is in the above range.

(8) It further includes a focusing means having a focus operating member that is operated when focusing and a focus lens that moves in the optical axis direction by the operation of the focus operating member,
The image pickup device picks up a subject image formed through the objective optical system and the focus lens, and the beam splitter passes the optical path through the objective optical system and the focus lens along the first optical path and the second optical path. The telescope according to (6) or (7), wherein the telescope is branched into an optical path.

  Thereby, it is possible to perform both the focus adjustment of the observation image observed through the eyepiece optical system and the captured image captured by the image sensor.

  According to the present invention, when zooming and changing the observation magnification in a telescope equipped with an image pickup device, the user can see when the range of the observation field of view becomes almost the same as the range of the shooting field on the image pickup device. This can be easily and reliably known from the change in the feeling of operating the zoom operation member. Therefore, if the image is taken in that state, it is possible to take an image with a field that is almost as wide as the observation field of view, so that it is possible to reliably prevent a mistake in taking a picture by mistaking the image field.

The zoom eyepiece and telescope of the present invention will be described below in detail based on preferred embodiments shown in the accompanying drawings.
FIG. 1 is a perspective view of an embodiment of a terrestrial telescope main body to which the zoom eyepiece of the present invention is attached, as seen from diagonally forward, and FIG. 2 is a perspective view of the terrestrial telescope main body shown in FIG. 3 is a sectional side view of the terrestrial telescope main body shown in FIG. 1, FIG. 4 is a perspective view showing an optical system of the terrestrial telescope main body shown in FIG. 1, and FIG. 5 is a perspective view of the prism unit from the opposite side to FIG. FIG. 6 is a block diagram of the terrestrial telescope main body shown in FIG.

  The terrestrial telescope (spotting scope) 10 of the present invention is composed of the terrestrial telescope main body 1 shown in these drawings and a zoom eyepiece 2 described later, and can be suitably used for, for example, bird observation. Before describing the zoom eyepiece 2 of the present invention, the terrestrial telescope body 1 will be described first.

  As shown in FIG. 1, the terrestrial telescope main body 1 includes a lens barrel 12 having a built-in objective optical system 11 and a housing 13 provided on the base end side of the lens barrel 12. A focus ring 32 as a focus operation member is rotatably installed above the front side of the housing 13.

  As shown in FIG. 2, a cylindrical eyepiece attachment port 14 into which the zoom eyepiece 2 can be detachably attached, a display 15, and various operation switches 4 are installed on the back side of the housing 13. Yes.

  In the configuration shown in the figure, the zoom eyepiece 2 mounted in the eyepiece mounting port 14 is an angle type ground telescope in which the optical axis of the zoom eyepiece 2 is inclined upward by a predetermined angle with respect to the optical axis of the objective optical system 11. The present invention can also be applied to a straight type in which both are parallel.

  The display 15 is composed of, for example, a liquid crystal display element. The display 15 can display a menu screen, a setting screen for various modes, an image captured by a CCD (Charge Coupled Device) image sensor 16 described later, and the like.

  The operation switches 4 include a main switch 41 for switching on / off the power, a release button 42, a menu key 43, a display key 44 for switching on / off of the display 15, a cursor displayed on the display 15, and the like. A four-way key 45 including an up key 451, a down key 452, a left key 453, and a right key 454, and an OK button 46 for confirming the selected content are provided.

  As shown in FIG. 3, an objective optical system 11 is installed near the tip of the lens barrel 12. In the housing 13, a focus lens (focus adjustment lens) 31 is installed coaxially with the objective optical system 11. The focus lens 31 moves in the direction of the optical axis by rotating the focus ring 32, and thereby focusing can be performed. As the focus lens moving mechanism 33 (not shown) that converts the rotational movement of the focus ring 32 into the straight movement of the focus lens 31, for example, a cylindrical cam mechanism or a feed screw mechanism can be used. The focus lens 31, the focus ring 32, and the focus lens moving mechanism 33 constitute the focusing unit 3.

  A prism unit 5 is installed behind the focus lens 31 in the housing 13. The prism unit 5 includes a first right-angle prism 51, a second right-angle prism 52, a third right-angle prism 53, a fourth right-angle prism 54, and a prism 55.

  The short-side surface of the first right-angle prism 51 and the long-side surface of the second right-angle prism 52 are bonded together, and this bonded surface constitutes a beam splitter 56. As shown in FIG. 4, the prism 55 is provided with an emission surface 551 from which light traveling toward the eyepiece optical system 21 of the zoom eyepiece 2 attached to the eyepiece attachment port 14 is emitted.

As shown in FIG. 3, the light that has passed through the objective optical system 11 and the focus lens 31 first enters the first right-angle prism 51. The light path L ₁ of the light is branched by the beam splitter 56 into a first optical path L ₂ toward the eyepiece optical system 21 and a second optical path L ₃ toward the CCD image sensor 16.

The direction of the first optical path L ₂ toward the eyepiece optical system 21 is changed by 180 ° due to reflection by the beam splitter 56 and reflection by the other short side surface of the first right-angle prism 51. As shown in FIG. 5, the first optical path L ₂ is reflected twice by the third right-angle prism 53 and changed again by 180 °, and further reflected twice by the prism 55, and is inclined upward, The light exits from the exit surface 551 and travels toward the eyepiece optical system 21.

  The first right-angle prism 51 and the third right-angle prism 53 constitute an erecting optical system (polo prism). Thereby, an erect image can be observed on the zoom eyepiece 2.

As shown in FIG. 3, the second optical path L ₃ toward the CCD image pickup device 16 passes through the beam splitter 56, travels into the fourth right-angle prism 54, and is reflected twice by the fourth right-angle prism 54. The direction changes by 180 ° and moves forward.

  In the housing 13, a CCD image sensor 16, an optical filter unit 17, and a reduction optical system 18 are further installed.

CCD image sensor 16 is disposed at a position for receiving the light traveling along the second optical path L _3. The position of the light receiving surface 161 of the CCD image pickup device 16 is optically equivalent to the position S (planned focal position) of the field frame 22 of the zoom eyepiece 2. Thereby, in the terrestrial telescope main body 1, an image obtained by the objective optical system 11 and the focus lens 31 can be picked up by the CCD image pickup device 16, and the same electronic image as that observed by the zoom eyepiece 2 can be taken. Can do. Note that the image sensor is not limited to the CCD image sensor 16, and for example, a CMOS sensor or the like may be used.

  The optical filter unit 17 is disposed so as to overlap the light receiving surface 161 side of the CCD image sensor 16. The optical filter unit 17 is formed by laminating an optical low-pass filter and an infrared cut filter. The optical low-pass filter reduces the spatial frequency component close to the sampling spatial frequency determined by the pixel interval of the CCD image sensor 16 from the spatial frequency of the subject light. By providing the optical low-pass filter, it is possible to prevent a false color (moire) from occurring.

  The infrared cut filter removes an infrared wavelength component. By installing the infrared cut filter, it is possible to prevent the CCD image pickup device 16 from receiving infrared light that is invisible to human eyes. As this infrared cut filter, for example, a filter having spectral transmittance characteristics as shown in FIG. 8 can be used.

A reduction optical system 18 is installed between the fourth right-angle prism 54 and the CCD image sensor 16 and the optical filter unit 17. From the focus lens 31, the light beam passing through the second optical path _{L 3} is reduced by the reduction optical system 18 to fit the size of the CCD imaging device 16, forms an image on the light receiving surface 161 of the CCD image sensor 16.

  As described above, in the terrestrial telescope main body 1, the entire optical system disposed between the objective optical system 11 including the objective optical system 11 and the light receiving surface 161 of the CCD image sensor 16, that is, the objective optical system 11, The focus lens 31, the beam splitter 56, the reduction optical system 18, and the optical filter unit 17 constitute an imaging optical system for the CCD imaging device 16.

  The angle of view of this imaging optical system is preferably 3.5 degrees or less. The focal length of the imaging optical system corresponding to this angle of view is generally 700 mm or more in terms of 35 mm film size. Here, the focal length in terms of 35 mm film size means that when the effective light receiving surface of the CCD image sensor 16 is enlarged to the area of the film exposure surface (36 mm × 24 mm) of the 35 mm silver film camera, the same image is displayed on the enlarged light receiving surface. A focal length that forms a subject image at a corner.

  The upper limit of the focal length of the imaging optical system is not particularly limited, but the focal length of the imaging optical system in the telescope of the present invention assumed to be practically used is about 20000 mm or less in terms of 35 mm film size.

  As shown in FIG. 6, the terrestrial telescope main body 1 has a CPU (Central Processing Unit) 60, a DSP (Digital Signal Processor) 61, and an SDRAM (Synchronous Dynamic Random Access Memory) 62 as a storage means as electrical circuit configurations. And an imaging signal processing circuit 63, a timing generator 64, an image data compression circuit 65, a memory interface 66, and an EEPROM (Electrically Erasable Programmable Read-Only Memory) 67 as a storage means. In addition, a slot (not shown) in which a memory card (recording medium) 100 can be loaded is provided in the housing 13.

  The CPU 60 is a control unit that comprehensively controls the terrestrial telescope main body 1 based on programs stored in advance and input signals from the operation switches 4 and performs various operation controls such as imaging control.

  The DSP 61 functions as image generation means for generating image data from the drive control of the CCD image pickup device 16 and the pixel signal from the CCD image pickup device 16, compression processing of image data, image data recording processing to the memory card 100, etc. It is a processor that functions as a control means that controls the overall processing of image processing and image recording, and is connected to the CPU 60 to communicate with each other so that control can be coordinated.

  In the SDRAM 62, a work area for performing work such as image data generation, a display 15 area, and the like are determined in advance.

  The timing generator 64 outputs sample pulses and the like to the CCD image pickup device 16 and the image pickup signal processing circuit 63 based on the control of the DSP 61, and controls these operations.

  The user can focus the observation image by operating the focus ring 32 in accordance with the distance to the observation object when observing through the zoom eyepiece 2. At this time, it is designed so that it can be recognized that the observation image viewed from the zoom eyepiece 2 is in focus when the imaging position (aerial image) of the observation image reaches the position S of the field frame 22. In other words, the user is designed to focus by turning the focus ring 32 so that the image formed at the position S of the field frame 22 can be clearly seen.

  When the user encounters an observation image to be photographed / recorded, the user can photograph / record the same electronic image as the observation image by operating the release button 42 to photograph. As described above, since the light receiving surface 161 of the CCD image pickup device 16 is at a position optically equivalent to the position S of the field frame 22, an object image is formed on the light receiving surface 161 of the CCD image pickup device 16 in this state. You can shoot images that are in focus.

  On the display 15, an image captured by the CCD image sensor 16 can be displayed as a moving image in real time as follows.

  The subject image formed on the light receiving surface 161 of the CCD image pickup device 16 is photoelectrically converted into charge data, and this charge data (signal) is used to create live view image data to be displayed on the display 15 for the CCD image pickup device 16. Are sequentially thinned out by a predetermined number of pixels, and subjected to correlated double sampling (CDS), automatic gain control (AGC), and analog-digital conversion in the image pickup signal processing circuit 63, and then input to the DSP 61. . In the DSP 61, signal processing such as predetermined color process processing and γ correction is performed on the input signal, and live view image data (luminance signal data Y, two color difference signal data Cr, Cb) is generated. .

  The live view image data is image data having a number of pixels smaller than the number of effective pixels of the CCD image pickup device 16 (the number of thinned data) corresponding to the number of display pixels of the display 15, and is based on the live view image data. The display 15 is displayed. The live view image data generation process is periodically updated as the CCD image pickup device 16 is read out, and is displayed on the display 15 as a real-time moving image.

  At the time of photographing / recording, the terrestrial telescope main body 1 operates as follows. When the release button 42 is pressed halfway and the photometric switch 421 is turned on, the CPU 60 performs an exposure calculation based on the output signal of the CCD image sensor 16. When the release button 42 is further fully pressed and the release switch 422 is turned on, the CPU 60 instructs the DSP 61 to perform a main exposure operation. The DSP 61 that has received this exposure command performs unnecessary charge sweeping control and exposure control (charge accumulation time control) of the CCD image sensor 16, and then the pixel from the CCD image sensor 16 via the image signal processing circuit 63 as described above. The charge data is read out without being thinned out and temporarily held in the SDRAM 62. The DSP 61 performs predetermined signal processing on the charge data read from the SDRAM 62, thereby generating still original image data for recording having a large number of pixel data.

  Further, the DSP 61 performs a pixel data thinning process from the generated recording still original image data to generate a screen nail (for example, 640 × 480 pixels) of a display still image, and displays the display 15 and the display 15 for a certain period of time. Display. Further, the DSP 61 performs image data compression processing on the generated still original image data for recording by the image data compression circuit 65, and the obtained compressed image data of a predetermined format such as JPEG, TIFF, etc. is stored in the memory interface. And output to the memory card 100.

  FIG. 7 is a half longitudinal sectional view showing an embodiment of the zoom eyepiece of the present invention, FIG. 8 is a longitudinal sectional view showing a part of FIG. 7 in an enlarged manner, and FIG. 9 is a view field range and a photographing field. It is a figure which shows typically both relationship in the state of the area where the range is substantially the same. Hereinafter, the zoom eyepiece 2 of the present invention will be described with reference to these drawings.

  As shown in FIG. 7, the zoom eyepiece 2 has a cylindrical main body ring 24 centered on the optical axis Ax, and a mounting sleeve that is installed on the object side of the main body ring 24 and has a smaller diameter than the main body ring 24. 25, a zoom operation ring (zoom operation member) 26 provided concentrically outside the main body ring 24, an eyepiece member 27 installed on the eyepiece side of the main body ring 24, and concentrically inside the main body ring 24. A cylindrical cam ring 28 provided and a cylindrical straight guide ring 29 provided concentrically inside the cam ring 28 are provided.

  The mounting sleeve 25 is a member integrated with the main body ring 24. The zoom eyepiece 2 is mounted on the terrestrial telescope body 1 by inserting and fitting the mounting sleeve 25 into the eyepiece mounting opening 14. In the illustrated configuration, the objective opening of the mounting sleeve 25 is sealed with a waterproof glass plate 70. Thereby, it is possible to prevent water from entering the zoom eyepiece 2.

  The zoom operation ring 26 is rotatable about the optical axis Ax with respect to the main body ring 24. A non-slip 261 is provided on the outer peripheral surface of the zoom operation ring 26 to prevent the hand from slipping when the zoom operation ring 26 is rotated.

  The eye contact member 27 is movable with respect to the main body ring 24 by a predetermined distance in the direction of the optical axis Ax. When observing with the naked eye, the eye contact member 27 is extended (state shown in FIG. 7), and when observing with glasses, the eye contact member is moved to the left side in FIG.

  The cam ring 28 is installed so as to rotate about the optical axis Ax with respect to the main body ring 24 and not to move in the optical axis Ax direction. The cam ring 28 is connected to the zoom operation ring 26 via a small screw 71 and rotates together with the zoom operation ring 26.

  The rectilinear guide ring 29 is fixed to the main body ring 24 and is installed so as not to rotate around the optical axis Ax and move in the optical axis Ax direction.

Such a zoom eyepiece 2 incorporates an eyepiece optical system 21. Eyepiece optical system 21 includes a first lens group L _4, a second lens group L _5, a third lens group L _6, consists of an eyepiece lens L _7, are arranged in this order from the object side (front side) Yes. Among these, the first lens group L ₄ , the second lens group L _5, and the third lens group L ₆ constitute a zoom optical system 23.

A first lens group L _4, and the second lens group L ₅ and the third lens group L _6, respectively, a movable lens group movable along the optical axis Ax direction. Eyepiece lens L ₇ is fixed to the vicinity of the rear end of the body ring 24, it does not move in the optical axis Ax direction. Further, the front side of the second lens group L _5, the field frame 22 is installed.

In a state where the zoom eyepiece 2 is mounted on the terrestrial telescope body 1, the light beam emitted from the emission surface 551 of the prism unit 5 passes through the first lens group L ₄ and forms an image at the position S of the field frame 22. The user observes the aerial image through the second lens unit L ₅ , the third lens unit L _6, and the eyepiece lens L ₇ .

The first lens unit L ₄ is located inside the mounting sleeve 25. The support frame 72 that supports the first lens group L _4, the cam follower (follower pins) 73 projecting radially outward is provided. The cam follower 73 is inserted into a rectilinear guide groove 291 formed in the rectilinear guide ring 29 and parallel to the optical axis Ax, and a cam groove 281 formed in the cam ring 28.

The second lens group L ₅ and the third lens unit L ₆ is located inside the linear guide ring 29, is supported on a common support frame 74, it moves in the optical axis Ax direction together. The support frame 74 is provided with a cam follower 75 protruding outward in the radial direction. The cam follower 75 is inserted into a rectilinear guide groove 292 formed in the rectilinear guide ring 29 and parallel to the optical axis Ax, and a cam groove 282 formed in the cam ring 28.

During zooming, when the zoom operation ring 26 is gripped and rotated, the cam follower 73 moves in the straight guide groove 291 and the cam groove 281, thereby driving the first lens unit L ₄ in the optical axis Ax direction. the second lens group L ₅ and the third lens group L ₆ is driven in the optical axis Ax direction by the cam follower 75 moves linearly movable guide grooves 292 and the cam groove 282. At this time, the first lens group L _4, and the second lens group L ₅ and the third lens group L _6, move their spacing changing. Thereby, the focal distance of the eyepiece optical system 21 changes continuously, and the observation magnification of the observation image can be changed.

  When the zoom eyepiece 2 is zoomed to change the observation magnification, the range of the observation field of view observed through the eyepiece optical system 21 naturally changes, but the range of the photographing field on the CCD image sensor 16 does not change. Therefore, the user cannot know how much the shooting field is, and there is a possibility that the desired shot image cannot be obtained.

  Accordingly, in the present invention, when the zoom operation ring 26 is rotated, the feeling of operating the zoom operation ring 26 is changed when the range of the observation field of view is approximately the same as the range of the shooting field. A click mechanism 76 is provided.

  In addition, the “state in which the range of the observation field of view is almost the same as the range of the photographing field” here means as follows. As shown in FIG. 9, the observation visual field range 200 is circular, and the photographing field range 300 is rectangular. However, “the observation visual field range 200 is almost as wide as the photographing field range 300. The “state” does not mean a state in which both areas (areas) are exactly the same, but the user senses that the observation field range 200 is almost the same as the photographing field range 300. This is a state determined by design as a state that can be recognized, and the magnitude relationship between the observation field range 200 and the photographing field range 300 means a state as shown in FIG. 9, for example.

  As shown in FIG. 8, the click mechanism 76 includes a click ball 761 installed in a side hole 262 formed in the wall portion of the zoom operation ring 26, and a coil that presses the click ball 761 radially inward. And a spring 762. The click ball 761 protrudes or retracts radially inward from the inner peripheral surface of the zoom operation ring 26 by the expansion and contraction of the coil spring 762.

  A small screw 763 is screwed into the side hole 262 from the outside so that the coil spring 762 and the click ball 761 are not detached.

  A recessed portion 241 into which a part of the click ball 761 can be inserted is formed at a predetermined position on the outer peripheral surface of the main body ring 24. The concave portion 241 is arranged at a position where the zoom operation ring 26 overlaps the click ball 761 when the position of the observation field of view is a position where the range of the observation visual field is almost the same as the range of the photographing field.

  When the zoom operation ring 26 is rotated, the click ball 761 rolls on the flat outer peripheral surface of the main body ring 24 when the observation visual field range is different from the shooting field range. The operation ring 26 rotates relatively smoothly. Then, when the range of the observation field of view becomes almost the same as the range of the shooting field, the click ball 761 enters the recess 241 and acts to stop the zoom operation ring 26 with a certain amount of force. A relatively large force is required to further rotate the zoom operation ring 26 from there. Due to this change in the feeling, the user can know that the range of the observation visual field has become almost the same as the range of the photographing field. If the release button 42 is pressed in this state, it is possible to shoot and record an image in the almost same range as the observation field of view, so that it is possible to reliably prevent a mistake in taking a picture by mistaking the range of the photographic field.

  Further, in this embodiment, when the range of the observation field of view is approximately the same as the range of the shooting field, the rotation of the zoom operation ring 26 is limited by a certain amount of force by the click mechanism 76. During this time, the zoom operation ring 26 can be prevented from rotating unintentionally at any time, and it is possible to more reliably prevent a mistake in shooting due to mistaking the range of the shooting field.

  FIG. 10 is a half longitudinal sectional view showing another embodiment of the zoom eyepiece of the present invention, and FIG. 11 is a longitudinal sectional view showing a part of FIG. Hereinafter, other embodiments of the zoom eyepiece of the present invention will be described with reference to these drawings. However, differences from the above-described embodiments will be mainly described, and description of similar matters will be omitted.

  The zoom eyepiece 2 'according to the present embodiment includes a fixing unit that can fix the zooming position in a state where the range of the observation field of view is approximately the same as the range of the photographing field. This fixing means includes a meshing portion 77 that meshes when the zoom operation ring 26 is moved in the optical axis Ax direction (the right direction in FIGS. 10 and 11) and prohibits the rotation operation of the zoom operation ring 26. Yes.

  As shown in FIG. 11, one or more protrusions 263 along the optical axis Ax direction are formed on a part of the inner peripheral surface of the zoom operation ring 26. A groove 283 into which the protrusion 263 can be inserted is formed in a part of the outer peripheral surface of the cam ring 28. In addition, a groove 242 into which the ridge 263 can be inserted is formed in a part of the outer peripheral surface of the main body ring 24. The protruding portion 263 and the groove 242 constitute the meshing portion 77.

  The small screw 71 is not provided between the zoom operation ring 26 and the cam ring 28, and in the normal state shown in FIG. 11, the cam operation ring is connected to the cam operation ring 26 by the engagement between the projection 263 and the groove 283. Rotational force is transmitted to 28, and both rotate together. In this normal state, the protrusion 263 is not engaged with the groove 242.

  In the normal state as described above, when the zoom operation ring 26 is operated so that the range of the observation field of view is substantially the same as the range of the photographing field, the click ball 761 is recessed 241 as in the above-described embodiment. Insert inside. In this state, the circumferential position of the ridge 263 coincides with the groove 242. When the zoom operation ring 26 is moved in the right direction in FIG. 11 from this state, the ridge 263 is engaged with the groove 242 and the zoom operation ring 26 is prohibited from rotating (zooming lock state).

  In such a zoom eyepiece 2 ′, the zoom operation ring 26 is rotated so that the observation visual field range is almost the same as the photographing field range, and then the zoom lock state is set as described above. The zoom position can be securely fixed so as not to shift. Accordingly, it is possible to more reliably prevent the zoom operation ring 26 from rotating unintentionally at a certain time during shooting, and to make a mistake in shooting by mistaking the range of the shooting field. It can be surely prevented.

  A recessed portion 243 into which a part of the click ball 761 can be inserted when the zooming lock state is set is formed at a predetermined position on the outer peripheral surface of the main body ring 24. Accordingly, when the zoom operation ring 26 is slid in the optical axis Ax direction to be in a zooming lock state, the zoom operation ring 26 can be fixed with a certain amount of force so that the zoom operation ring 26 does not return. It can be surely prevented from being released.

  The zoom eyepiece and telescope of the present invention have been described above with respect to the illustrated embodiment. However, the present invention is not limited to this embodiment, and each part constituting the zoom eyepiece and the telescope can be any one that can exhibit the same function. It can be replaced with the configuration of Moreover, arbitrary components may be added.

  In the terrestrial telescope 10 of the present embodiment, the zoom eyepiece 2 is detachable and replaceable from the terrestrial telescope main body 1, but the telescope of the present invention can be replaced even if the zoom eyepiece is integrated. Good.

  Moreover, although the case where the present invention is applied to a terrestrial telescope has been described in the above-described embodiment, the present invention is not limited to this and can be applied to various telescopes including an astronomical telescope.

It is the perspective view seen from diagonally forward which shows embodiment of the terrestrial telescope main body used as the object which mounts the zoom eyepiece of this invention. It is the perspective view which looked at the ground telescope main body shown in FIG. 1 from diagonally backward. It is a cross-sectional side view of the terrestrial telescope main body shown in FIG. It is a perspective view which shows the optical system of the terrestrial telescope main body shown in FIG. It is the side view which looked at the prism unit from the opposite side to FIG. It is a block diagram of the terrestrial telescope main body shown in FIG. It is a semi-longitudinal sectional view showing an embodiment of a zoom eyepiece of the present invention. It is a longitudinal cross-sectional view which expands and shows a part of FIG. It is a figure which shows typically the relationship between both in the state where the range of an observation visual field and the range of an imaging | photography field are substantially the same area. It is a semi-longitudinal sectional view showing another embodiment of the zoom eyepiece of the present invention. It is a longitudinal cross-sectional view which expands and shows a part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terrestrial telescope main body 10 Terrestrial telescope 11 Objective optical system 12 Lens tube 13 Case 14 Eyepiece attachment port 15 Display 16 CCD image pick-up element 161 Light-receiving surface 17 Optical filter unit 18 Reduction optical system 2, 2 'Zoom eyepiece 21 Eyepiece optical system 22 Field of view Frame 23 Zoom optical system 24 Body ring 241 Recess 242 Groove 243 Recess 25 Mounting sleeve 26 Zoom operation ring 261 Non-slip 262 Side hole 263 Projection 27 Eyepiece member 28 Cam ring 281, 282 Cam groove 283 Groove 29 Straight guide ring 291, 292 Straight guide groove 3 Focusing means 31 Focus lens 32 Focus ring 33 Focus lens moving mechanism 4 Operation switches 41 Main switch 42 Release button 421 Photometry switch 422 Release switch 43 Menu key 44 D Spray key 45 4-direction key 451 Up-direction key 452 Down-direction key 453 Left-direction key 454 Right-direction key 46 OK button 5 Prism unit 51 First right-angle prism 52 Second right-angle prism 53 Third right-angle prism 54 Fourth Right angle prism 55 Prism 56 Beam splitter 60 CPU
61 DSP
62 SDRAM
63 Image signal processing circuit 64 Timing generator 65 Image data compression circuit 66 Memory interface 67 EEPROM
70 waterproof glass plate 71 machine screw 72 support frame 73 cam follower 74 support frame 75 cam follower 76 click mechanism 761 click ball 762 coil spring 77 meshing part 100 memory card 200 range of observation field 300 range of photographing field Ax optical axis L ₁ optical path L ₂ 1st optical path L ₃ 2nd optical path L ₄ 1st lens group L ₅ 2nd lens group L ₆ 3rd lens group L ₇ Eyepiece S Position

Claims (8)

A zoom eyepiece having an eyepiece optical system provided with a zoom optical system and a zoom operation member operated when zooming the zoom optical system,
An objective optical system, an imaging element that captures a subject image formed via the objective optical system, a first optical path that goes to the eyepiece optical system, and a second optical path that goes to the imaging element via the optical path that has passed through the objective optical system It can be used by attaching to a telescope body equipped with a beam splitter that branches into
When the zoom operation member is operated, the zoom operation is performed when the range of the observation field of view observed through the eyepiece optical system is almost the same as the range of the photographing field on the image sensor. A zoom eyepiece characterized in that the feel of operating a member changes.   The zoom eyepiece according to claim 1, further comprising a click mechanism that causes the touch to change.   3. The zoom eyepiece according to claim 1, further comprising a fixing unit capable of fixing a zooming position in a state where the range of the observation field of view is substantially the same as the range of the photographing field.   4. The zoom eyepiece according to claim 3, wherein the fixing unit includes an engagement portion that engages when the zoom operation member is moved in the optical axis direction and prohibits the operation of the zoom operation member.   The telescope main body further includes a focusing unit having a focus operation member that is operated when focusing and a focus lens that moves in an optical axis direction by the operation of the focus operation member, and the imaging element includes the objective optical 2. An object image formed through a system and the focus lens is picked up, and the beam splitter branches the optical path passing through the objective optical system and the focus lens into the first optical path and the second optical path. Or a zoom eyepiece according to any one of 4 to 4. An objective optical system;
A zoom eyepiece having an eyepiece optical system including a zoom optical system, and a zoom operation member operated when zooming the zoom optical system;
An image sensor that captures a subject image formed via the objective optical system;
A telescope comprising a beam splitter for branching an optical path passing through the objective optical system into a first optical path toward the eyepiece optical system and a second optical path toward the image sensor;
In the zoom eyepiece, when the zoom operation member is operated, the range of the observation field of view observed through the eyepiece optical system is substantially the same as the range of the shooting field on the image sensor. A telescope characterized in that the feel of operating the zoom operation member sometimes changes.   The imaging optical system of the imaging device is configured by the entire optical system disposed between the objective optical system including the objective optical system and the light receiving surface of the imaging device, and the angle of view of the imaging optical system is 3. The telescope according to claim 6 which is 5 degrees or less. A focusing unit having a focus operating member that is operated when focusing and a focus lens that moves in the optical axis direction by the operation of the focus operating member;
The image pickup device picks up a subject image formed through the objective optical system and the focus lens, and the beam splitter passes the optical path through the objective optical system and the focus lens along the first optical path and the second optical path. The telescope according to claim 6 or 7, wherein the telescope is branched into an optical path.

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