JP2021184103A - Lens unit and projection device - Google Patents

Abstract

To provide a lens unit with good slidability while preventing foreign matters from entering and a projection device.SOLUTION: A lens unit includes: a cylindrical first cover component 610 that covers a first lens component (fixed lens barrel 410) and is fixed to the first lens component; a cylindrical second cover component 620 that covers a second lens component (movable cam lens barrel 430) movable with respect to the first lens component and is fixed to the second lens component, and that is disposed to overlap with a front end of the first cover component 610; a cylindrical third cover component 630 that covers a third lens component (focus lens 520) movable with respect to the second lens component and is fixed to the third lens component, and that is disposed to overlap with a front end of the second cover component 620; a first sliding member 710 disposed between the first cover component 610 and second cover component 620; and a second sliding member 720 disposed between the second cover component 620 and third cover component 630 and having frictional resistance different from the first sliding member 710.SELECTED DRAWING: Figure 6

Description

The present invention relates to a lens unit and a projection device.

Conventionally, electronic devices such as cameras and projectors have been proposed in which precision parts such as lenses are housed in a telescopic tubular lens barrel part. For example, a projector collects light emitted from a light source on a micromirror display element called a DMD (Digital Micromirror Device) or a liquid crystal plate, and colors it on a screen via a tubular lens unit. Display the image.

The projection device of Patent Document 1 includes a fixed lens and a movable lens for adjusting the zoom and focus of the projected image in the projection side optical system. The movable lens can be moved relative to the fixed lens. The movable lens barrel that supports the movable lens is configured to slide while overlapping with the fixed lens barrel that supports the fixed lens.

The image pickup apparatus of Patent Document 2 discloses a technique for improving waterproof performance by providing waterproof packings at a plurality of places between an outer cylinder and an inner cylinder of a lens barrel in a lens unit used for a waterproof camera. This makes it possible to improve the waterproof performance of this image pickup device.

Japanese Unexamined Patent Publication No. 2009-92817 Japanese Unexamined Patent Publication No. 2005-215152

In the projection device of Patent Document 1, when the movable lens and the fixed lens are relatively slid, it is assumed that foreign matter such as dust invades through the gap between the parts and the image quality is deteriorated. The configuration of Patent Document 2 has a problem that when the outer cylinder and the inner cylinder of the lens barrel are driven, the frictional resistance of the waterproof packing is large and the slidability of the lens barrel is lowered, and further, zooming and focusing are performed. Therefore, when operating the lens unit, there is a problem that the zoom lens also moves when adjusting the focus because there is frictional resistance between the lens covers.

In view of the above points, it is an object of the present invention to provide a lens unit and a projection device having good slidability and capable of correctly driving a focus lens.

The lens unit according to the present invention has a case, a first lens component, a second lens component, and a third lens component, and has a lens unit main body fixed to the case via the first lens component, and the lens unit body. The first cover component including the tubular portion that covers the rear end of the first lens component and is fixed to the case, and the second lens component that is movable with respect to the first lens component are covered by the second lens component. A tubular second cover component that is fixed and whose rear end is overlapped with the front end of the first cover component via a first sliding member, and the first lens component that is movable with respect to the first lens component. A tubular third cover component that covers the 3 lens component and is fixed to the third lens component and whose rear end is arranged so as to overlap with the front end of the second cover component via the second sliding member, and the first cover component. The sliding resistance of the second cover component with respect to one cover component is larger than the sliding resistance of the third cover component with respect to the second cover component.

The projection device according to the present invention includes the above-mentioned lens unit, a light source device, a display element that is irradiated with light from the light source device to form image light, and a projection device that controls the display element and the light source device. It has a control unit, and the lens unit is characterized in that the image light emitted from the display element is projected onto a screen.

According to the present invention, it is possible to provide a lens unit and a projection device having good slidability and capable of correctly driving a zoom lens and a focus lens.

It is an external perspective view which shows the projection apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the functional block of the projection apparatus which concerns on Embodiment 1 of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on Embodiment 1 of this invention. It is a plan view of the inside of the case of the light source apparatus which concerns on Embodiment 1 of this invention. It is an exploded perspective view seen from the front upper left of the lens unit which concerns on Embodiment 1 of this invention. It is an exploded perspective view seen from the lower right front of the lens unit which concerns on Embodiment 1 of this invention. It is a developed view of the sliding member which concerns on Embodiment 1 of this invention. FIG. 3 is a sectional view taken along line VIII-VIII of the lens unit shown in FIG. 3 according to the first embodiment of the present invention. It is a figure which shows the part of the lens unit which concerns on Embodiment 2 of this invention, (a) is the development view of the sliding member of a medium width, (b) is the 1st cover which arranged the sliding member of a medium width. It is a figure which shows a part. It is a figure which shows the part of the lens unit which concerns on Embodiment 2 of this invention, (a) is the development view of the narrow sliding member, (b) is the 2nd cover which arranged the narrow sliding member. It is a figure which shows a part.

(Embodiment 1)
Hereinafter, embodiments for carrying out the present invention will be described. FIG. 1 is an external perspective view of the projection device 10. The projection device 10 of the present embodiment includes an upper main body case 10a and a lower main body case 10b. The front panel 12, the back panel 13, the right panel 14, and the left panel 15, which are the side plates of the housing of the projection device 10, are erected downward from the outer peripheral edge of the upper main body case 10a. The lower ends of the panels 12 to 15 abut on the outer peripheral edge of the lower body case 10b. Therefore, the projection device 10 is formed in a substantially rectangular parallelepiped shape by the upper main body case 10a and the lower main body case 10b. In the present embodiment, the left and right in the projection device 10 indicate the left and right direction with respect to the projection direction, and the front and back indicate the front-back direction with respect to the screen side direction of the projection device 10 and the traveling direction of the light flux.

The upper surface panel 11 of the housing of the projection device 10 is provided with a key / indicator unit 37 and a projection image adjustment unit 11a. The key / indicator unit 37 is notified when a power switch key, a power indicator for notifying power on / off, a projection switch key for switching projection on / off, a light source device, a display element, a control circuit, or the like overheats. Keys and indicators for making various settings such as overheating indicators are arranged. The projected image adjusting unit 11a of the present embodiment includes two rotary knobs. By operating this rotary knob, the zoom position of the projection side optical system described later in FIG. 4 and the like is adjusted, and the size and focus of the projected image are adjusted. Further, although not shown, the projection device 10 includes an Ir receiving unit that receives a control signal from a remote controller.

Intake holes 310 are provided in the front right corners 501 of the front panel 12 and the right panel 14. On the left side of the front panel 12, a mortar-shaped recessed light emitting portion 12a is provided. An intake hole 320 is formed on the inner wall of the light emitting portion 12a on the left side panel 15 side. The projection device 10 has a projection port 12b and a lens cover 19 that covers the projection port 12b in the light emitting unit 12a.

A height adjustment button 12c is provided at the lower end of the front panel 12. The projection device 10 includes a support leg inside the front panel 12 side. The projection device 10 can infest its support legs from below while the height adjustment button 12c is pressed. Therefore, the user can fix the support leg at an arbitrary amount by operating the height adjustment button 12c and adjust the height and inclination of the projection device 10.

The rear panel 13 is provided with an input / output connector portion provided with a USB terminal, a D-SUB terminal for inputting an image signal, an S terminal, an RCA terminal, and various terminals 20 such as a power adapter plug. Further, in the back panel 13, an intake hole 330 is formed in the corner portion 503 on the right side panel 14, and an exhaust hole 340 is also formed in the corner portion 504 on the left side panel 15.

Next, the projection device control unit of the projection device 10 will be described with reference to the functional block diagram of FIG. The projection device control unit is composed of a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like.

The control unit 38 controls the operation of each circuit in the projection device 10, and is composed of a ROM that fixedly stores operation programs such as a CPU and various settings, a RAM that is used as a work memory, and the like. There is.

Then, the image signals of various standards input from the input / output connector unit 21 by the projection device control unit are in a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted to be unified into the image signal of, it is output to the display encoder 24.

The display encoder 24 expands and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

The display drive unit 26 drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24.

The projection device 10 irradiates the display element 51 with a light bundle of the light source light emitted from the light source device 60 via a light guide optical system described later, so that an optical image (image) is produced by the reflected light of the display element 51. Form. The projection device 10 projects the formed optical image onto a screen via a projection-side optical system, which will also be described later, and displays an image. The zoom lens 510 and the focus lens 520 of the projection side optical system are driven for zoom adjustment and focus adjustment by the projection image adjustment unit 11a.

The image compression / decompression unit 31 performs recording processing in which the luminance signal and color difference signal of the image signal are data-compressed by processing such as ADCT and Huffman coding and sequentially written to the memory card 32 which is a detachable recording medium.

Further, the image compression / decompression unit 31 reads out the image data recorded in the memory card 32 in the reproduction mode, and decompresses the individual image data constituting the series of moving images in units of one frame. Then, the image compression / decompression unit 31 outputs the image data to the display encoder 24 via the image conversion unit 23, and performs a process of displaying a moving image or the like based on the image data stored in the memory card 32.

The operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper surface panel 11 of the housing is directly transmitted to the control unit 38. The key operation signal from the remote controller is received by the Ir receiving unit 35, and the code signal demodulated by the Ir processing unit 36 is output to the control unit 38.

A voice processing unit 47 is connected to the control unit 38 via a system bus (SB). The voice processing unit 47 includes a sound source circuit such as a PCM sound source, converts sound data into analog in the projection mode and the reproduction mode, and drives the speaker 48 to emit loud sound.

Further, the control unit 38 controls the light source control circuit 41 as the light source control means. The light source control circuit 41 individually emits light from the excitation light irradiation device in the green light source device of the light source device 60 and the red light source device so that light in a predetermined wavelength band required at the time of image generation is emitted from the light source device 60. To control. The light in a predetermined wavelength band emitted from the light source device 60 is reflected by the irradiation mirror 185 and is applied to the display element 51.

The control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature by a plurality of temperature sensors provided in the light source device 60 and the like, and controls the rotation speed of the cooling fan from the result of the temperature detection. Further, when the control unit 38 receives an instruction to turn off the power of the projection device 10, the cooling fan drive control circuit 43 uses a timer to maintain the rotation of the cooling fan even after the power of the projection device 10 is turned off. It is possible to perform control such as determining the timing for turning off the power of the projection device 10 main body according to the result of temperature detection by the temperature sensor.

Next, the internal structure of the projection device 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projection device 10. The projection device 10 includes a power supply device 301, a control circuit board 302, and a light source device 60. Further, the projection device 10 includes an intake fan 260, an intake fan 270, and an exhaust fan 280 as cooling fans.

The light source device 60 is arranged substantially in the center of the housing of the projection device 10. The light source device 60 houses an optical member such as a light source, a lens, and a mirror inside by means of a case 61. The power supply device 301 is arranged on the left side panel 15 side of the light source device 60. The board of the power supply device 301 is arranged substantially parallel to the left panel 15. The control circuit board 302 is arranged on the back panel 13 side of the light source device 60. The control circuit board 302 is arranged substantially perpendicular to the vertical direction. The control circuit board 302 includes a power supply circuit block, a light source control block, and the like. Further, the control circuit board 302 can be divided into a plurality of control circuit boards 302 for each function such as a power supply circuit block and a light source control block.

Here, the internal structure of the light source device 60 will be described. FIG. 4 is a schematic plan view of the light source device 60. The light source device 60 is a red light source device 120 which is a light source of red wavelength band light, a green light source device 80 which is a light source of green wavelength band light, a blue light source device which is a light source of blue wavelength band light, and an excitation light source. A certain excitation light irradiation device 70 is provided. The green light source device 80 is composed of an excitation light irradiation device 70 and a fluorescent plate device 100. The light source device 60 has a light guide optical system 140. The light guide optical system 140 combines the light bundles of the green wavelength band light, the blue wavelength band light, and the red wavelength band light, and guides the light beam bundles of each color wavelength band on the same optical path.

The excitation light irradiation device 70 is arranged on the right side panel 14 side of the projection device 10 housing. The excitation light irradiation device 70 includes a plurality of solid-state light emitting elements arranged so that the optical axis is parallel to the back panel 13. The solid-state light emitting device of the present embodiment is a plurality of blue laser diodes 71 that emit blue wavelength band light. Further, the plurality of blue laser diodes 71 are arranged side by side in parallel with the right panel 14. These blue laser diodes 71 are fixed to the holder 74.

Further, the excitation light irradiation device 70 includes a reflection mirror 76, a diffusion plate 78, and a heat sink 81. The reflection mirror 76 converts the optical axis of the light emitted from each blue laser diode 71 toward the diffuser plate 78 by approximately 90 degrees. The diffuser plate 78 diffuses the emitted light from each blue laser diode 71 reflected by the reflection mirror 76 at a predetermined diffusion angle. As shown in FIG. 3, the heat sink 81 is arranged between the blue laser diode 71 and the right panel 14.

Returning to FIG. 4, on the optical path from each blue laser diode 71, a collimator lens 73 that enhances the directivity of the emitted light from the blue laser diode 71 and converts it into parallel light is arranged. These collimator lenses 73 are held in the holder 74 together with the blue laser diode 71.

The red light source device 120 includes a red light source 121 arranged so that the light bundle of the blue laser diode 71 and the optical axis are parallel to each other, and a condenser lens group 125 that collects the light emitted from the red light source 121. .. The red light source 121 is a red light emitting diode which is a solid-state light emitting element that emits red wavelength band light. The red light source device 120 is arranged so that the optical axis of the red wavelength band light emitted by the red light source device 120 intersects the optical axis of the green wavelength band light emitted from the fluorescent plate 101. Further, the red light source device 120 includes a heat sink 130 on the right side panel 14 side of the red light source 121.

The fluorescent plate device 100 constituting the green light source device 80 includes a fluorescent plate 101, a motor 110, condensing lenses 117a and 117b on the incident side, and a condensing lens 115 on the emitting side. The fluorescent plate 101 is a fluorescent wheel arranged so as to be orthogonal to the optical axis of the light emitted from the excitation light irradiation device 70. The fluorescent plate 101 is rotationally driven by a motor 110. The condenser lenses 117a and 117b condense the light bundle of the excitation light emitted from the excitation light irradiation device 70 on the fluorescent plate 101. The condenser lens 115 collects a bundle of light rays emitted from the fluorescent plate 101 in the direction of the front panel 12. The fluorescent plate device 100 is arranged above the condenser lenses 117a, 117b, 115. Therefore, a part of the lower part of the fluorescent plate 101 is arranged on the optical path of the condenser lenses 117a, 117b, 115.

On the fluorescent plate 101, a fluorescence light emitting region and a diffusion transmission region are arranged side by side in the circumferential direction. The fluorescence emission region receives the blue wavelength band light emitted from the blue laser diode 71 as excitation light, and emits the excited fluorescent light in the green wavelength band. The diffuse transmission region diffuses and transmits the light emitted from the blue laser diode 71. The diffused and transmitted emitted light is emitted as blue wavelength band light of the light source device 60.

The light guide optical system 140 includes a first dichroic mirror 141, a condenser lens 149, a second dichroic mirror 148, a first reflection mirror 143, a condenser lens 146, a second reflection mirror 145, and a condenser lens 147. The first dichroic mirror 141 is located at a position where the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent plate 101 intersect with the red wavelength band light emitted from the red light source device 120. Is placed in. The first dichroic mirror 141 transmits blue wavelength band light and red wavelength band light, and reflects green wavelength band light. The optical axis of the green wavelength band light reflected by the first dichroic mirror 141 is converted by 90 degrees in the direction of the left panel 15 toward the condenser lens 149. Therefore, the optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 coincides with the optical axis of the green wavelength band light reflected by the first dichroic mirror 141.

The condenser lens 149 is arranged on the left side panel 15 side of the first dichroic mirror 141. The red wavelength band light transmitted through the first dichroic mirror 141 and the green wavelength band light reflected by the first dichroic mirror 141 are both incident on the condenser lens 149. The second dichroic mirror 148 is arranged on the left side panel 15 side of the condenser lens 149 and on the back panel 13 side of the condenser lens 147. The second dichroic mirror 148 reflects the red wavelength band light and the green wavelength band light, and transmits the blue wavelength band light. Therefore, the red wavelength band light and the green wavelength band light collected by the condenser lens 149 are reflected by the second dichroic mirror 148 and converted to the back panel 13 side by 90 degrees. A condenser lens 173 is arranged on the back panel 13 side of the second dichroic mirror 148. The red wavelength band light and the green wavelength band light reflected by the second dichroic mirror 148 are incident on the condenser lens 173.

The first reflection mirror 143 is arranged on the optical axis of the blue wavelength band light transmitted through the fluorescent plate 101, that is, between the condenser lens 115 and the front panel 12. The first reflection mirror 143 reflects the blue wavelength band light and converts the optical axis of the blue wavelength band light by 90 degrees in the direction of the left panel 15. The condenser lens 146 is arranged on the left side panel 15 side of the first reflection mirror 143. Further, the second reflection mirror 145 is arranged on the left side panel 15 side of the condenser lens 146. The second reflection mirror 145 converts the optical axis of the blue wavelength band light reflected by the first reflection mirror 143 and condensed by the condenser lens 146 to the rear panel 13 side by 90 degrees. The condenser lens 147 is arranged on the back panel 13 side of the second reflection mirror 145. The blue wavelength band light reflected by the second reflection mirror 145 passes through the second dichroic mirror 148 via the condenser lens 147 and is incident on the condenser lens 173. In this way, the light bundles of the red, green, and blue wavelength band lights guided by the light guide optical system 140 are guided on the same optical path of the light source side optical system 170.

The light source side optical system 170 includes a condenser lens 173, a light guide device such as a light tunnel or a glass rod, a condenser lens 178, an optical axis conversion mirror 179, a condenser lens 183, an irradiation mirror 185, and a condenser lens 195. Since the condenser lens 195 emits the image light emitted from the display element 51 arranged on the rear panel 13 side of the condenser lens 195 toward the projection side optical system 220, it is a part of the projection side optical system 220. But it is also.

Each light beam bundle emitted from the condenser lens 173 is incident on the light guide device 175. Each ray bundle incident on the light guide device 175 becomes a light beam bundle having a uniform intensity distribution by the light guide device 175.

An optical axis conversion mirror 179 is arranged on the optical axis on the rear panel 13 side of the light guide device 175 via the condenser lens 178. The light beam bundle emitted from the exit port of the light guide device 175 is focused by the condenser lens 178 and then converted into an optical axis toward the condenser lens 183 by the optical axis conversion mirror 179.

The light beam bundle reflected by the optical axis conversion mirror 179 is focused by the condenser lens 183 and then irradiated to the display element 51 by the irradiation mirror 185 via the condenser lens 195 at a predetermined angle. A heat sink 190 is provided on the back panel 13 side of the display element 51. The display element 51, which is a DMD, is cooled by the heat sink 190. Further, the plate surface of the fin 191 formed behind the heat sink 190 is formed perpendicular to the vertical direction.

The light bundle, which is the light source light applied to the image forming surface of the display element 51 by the light source side optical system 170, is reflected by the image forming surface of the display element 51 and projected onto the screen as projected light via the projection side optical system 220. Will be done.

The projection side optical system 220 includes a condenser lens 195, a zoom lens 510, and a focus lens 520. The zoom lens 510 and the focus lens 520 are built in the movable lens barrel of the lens unit 200, which will be described later. Further, the zoom lens 510 and the focus lens 520 are fixed to individual movable lens barrels, and the zoom adjustment and the focus adjustment can be manually performed by the projection image adjustment unit 11a.

By configuring the projection device 10 in this way, when the fluorescent plate 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, the red, green, and blue wavelength band lights are guided. It is incident on the light guide device 175 via the optical system 140, and further incident on the display element 51 via the light source side optical system 170. Therefore, the DMD, which is the display element 51 of the projection device 10, can project a color image on the screen by displaying the light of each color in a time-division manner according to the data.

Next, the configuration of the lens unit 200 will be described. FIG. 5 is an exploded perspective view of the lens unit 200 as viewed from the upper left front. FIG. 6 is an exploded perspective view of the lens unit 200 as viewed from the lower right. 7 is a diagram showing sliding members 710 and 720, and FIG. 8 is a sectional view taken along line VIII-VIII of the lens unit 200 shown in FIG.

The lens unit 200 includes a lens unit main body 400 and a lens barrel cover 600. The lens unit main body 400 has a fixed lens barrel 410 as a first lens component, a straight guide lens barrel 420, a movable cam lens barrel 430 as a second lens component, and a front movable lens barrel 440 as lens barrels. Further, the lens unit main body 400 has a zoom lens 510 (see FIG. 8) and a focus lens 520 which is a third lens component as a lens unit.

As shown in FIG. 8, the fixed lens barrel 410 is fixed to the opening 61a formed in the closed space of the case 61 of the light source device 60. The fixed lens barrel 410 guides the image light emitted from the inside of the case 61 into the lens barrel. In FIG. 5, the fixed lens barrel 410 has a substantially square plate-shaped flange portion 411 at the rear end, and a cylindrical portion 412 opened in the front-rear direction at the substantially center. Through holes 411a for screws are formed at the four corners of the flange portion 411. Further, through holes 411b for inserting positioning pins are formed in the left and right straight portions of the flange portion 411.

In FIG. 8, the straight guide lens barrel 420 is formed in a cylindrical shape, and its rear end side is arranged in the cylindrical portion 412. The straight guide lens barrel 420 houses the zoom lens 510 inside. The linear guide lens barrel 420 is restricted from moving backward by the locking projection 421 (see FIG. 5) formed on the outer peripheral side surface on the rear end side abuts on the front end of the cylindrical portion 412. Inside the cylindrical portion 412, an inner peripheral rib 412a that projects radially in the inner diameter direction is formed. The straight guide barrel 420 and the fixed barrel 410 have a screw S1 inserted into a screw hole (not shown) provided at the rear end of the straight guide barrel 420 and a through hole for a screw provided in the cylindrical portion 412. By being screwed in, they are fixed to each other.

The straight guide lens barrel 420 is formed with a linear through hole 422 in the front-rear direction. The straight guide lens barrel 420 has through holes 422 at substantially equal intervals in the circumferential direction. The straight guide lens barrel 420 has a screw hole 423 into which the screw S2 is inserted on the lower side surface on the rear side. Further, although not shown, a protrusion provided on the inner circumference of the movable cam lens barrel 430 engages with an engaging groove provided on the outer periphery of the straight guide lens barrel 420. As a result, the straight guide lens barrel 420 guides the rotational movement of the movable cam lens barrel 430 in the circumferential direction.

As shown in FIGS. 5 and 6, the movable cam lens barrel 430 has cam grooves 431a and 431b formed obliquely in the circumferential direction. The rear cam groove 431a extends counterclockwise as it goes forward when viewed from the rear, and the front cam groove 431b extends clockwise as it goes forward when viewed from the rear. Three cam grooves 431a and three cam grooves 431b are provided at equal intervals in the outer peripheral direction of the movable cam lens barrel 430. Further, as shown in FIG. 6, the movable cam lens barrel 430 has a rotating groove 432 extending in the circumferential direction behind the cam groove 431b.

The movable cam lens barrel 430 is provided so as to insert and cover the straight guide lens barrel 420 inside. Then, the head of the screw S2 of the linear guide lens barrel 420 engages with the rotation groove 432 of the movable cam lens barrel 430, so that the movable cam lens barrel 430 moves in the front-rear direction with respect to the linear guide lens barrel 420. It is restricted and allowed to rotate in the circumferential direction. Further, in the movable cam lens barrel 430, the rotation angle of the movable cam lens barrel 430 is restricted to a predetermined amount by abutting the head of the screw S2 on both end edges of the rotation groove 432.

The forward movable lens barrel 440 is formed in a substantially cylindrical shape and is housed in the straight guide lens barrel 420. Further, the front movable lens barrel 440 accommodates the focus lens 520 inside. The anterior movable lens barrel 440 has a protrusion 441 protruding outward on the outer surface on the rear end side. The protrusion 441 is formed by fixing the cam follower 441b to the screw hole 441a formed on the outer surface by a screw.

The protrusion 441 of the forward movable lens barrel 440 engages with the through hole 422 of the straight guide lens barrel 420 and the cam groove 431b of the movable cam lens barrel 430.

The zoom lens 510 is formed in a substantially columnar shape as a whole, and has a protrusion 511 protruding outward on the outer surface on the front side. The protrusion 511 is formed by fixing the cam follower 511b to the screw hole 511a formed on the outer surface by a screw.

The focus lens 520 is formed in a substantially columnar shape as a whole, and the outer peripheral side surface on the rear side is formed as a male screw portion 521. The focus lens 520 is positioned with respect to the front movable lens barrel 440 by screwing the male screw portion 521 with the female screw portion 442 in the front movable lens barrel 440. The front-back position of the focus lens 520 with respect to the anterior movable lens barrel 440 is determined by the screwing depth of the male screw portion 521 and the female screw portion 442. The focus lens 520 has four screw holes 522 on the outer peripheral side surface on the front end side. The screw holes 522 are formed at substantially equal intervals in the circumferential direction.

Returning to FIG. 5, the lens barrel cover 600 has a first cover component 610, a second cover component 620, and a third cover component 630. The first cover component 610 is formed in a substantially cylindrical shape, and has a substantially rectangular flange portion 611 on the rear end side. Through holes 611a for screws are formed at the four corners of the flange portion 611. A rib 612 extending forward from the flange portion 611 is formed on the outer peripheral surface of the first cover component 610. The ribs 612 are formed at a plurality of locations on the outer peripheral side surface of the first cover component 610. The first cover component 610 is fixed to the case 61 by a screw inserted through the through hole 611a and the through hole 411a of the fixed lens barrel 410. At this time, the fixed lens barrel 410 is positioned with respect to the opening 61a by a positioning pin (not shown) of the case 61 inserted into the through hole 411b. The fixed lens barrel 410 is fixed together with the first cover component 610 by co-tightening.

A first sliding member 710 is wound around the outer periphery of the first cover component 610 at a position in front of the rib 612. Here, the first sliding member 710 is formed in a band shape as shown in the developed view of FIG. 7. The first sliding member 710 has an engaging portion 711 including a convex portion 711a in a substantially center in the width direction on one end side in the longitudinal direction, and an engaged portion including a concave portion 712a in a substantially center in the width direction on the other end side. It has a part 712. The convex portion 711a is formed in a long rectangular shape. The recess 712a is formed by being cut out in an elongated rectangular shape. The recess 712a is formed so as to be surrounded by a substantially U-shaped frame portion 712b. The concave portion 712a of the engaged portion 712 has a shape corresponding to the convex portion 711a of the engaging portion 711. A linear portion 713 having a substantially constant width is formed between the engaging portion 711 and the engaged portion 712. The width of the straight line portion 713 is substantially the same as the width of the frame portion 712b.

The first sliding member 710 has a layered structure. The first sliding member 710 is formed by laminating a slidable, airtight and stretchable elastic member such as urethane on a flexible and less stretchable base material such as a pet film. This telescopic member is compressible in the thickness direction and has resilience. The first sliding member 710 is fixed to the component to be attached by applying an adhesive or an adhesive to the surface of the base material opposite to the elastic member.

As shown in FIG. 5, the first sliding member 710 is wound and fixed to the outer periphery of the first cover component 610. When the convex portion 711a of the engaging portion 711 is engaged with the concave portion 712a of the engaged portion 712, the convex portion 711a is brought into close contact with the concave portion 712a in the width direction so as to be sandwiched between the concave portions 712a, and has close contact or a slight gap in the length direction. It is loosely fitted. As a result, the first sliding member 710 can improve the airtightness in the width direction while preventing the intrusion of dust from the seams at the ends. Further, the first sliding member 710 can absorb dimensional variations in the length of the first sliding member 710 and the outer peripheral length of the first cover component 610.

The second cover component 620 is formed in a substantially cylindrical shape. The second cover component 620 has a large diameter portion 621 with an enlarged cylinder diameter on the rear end side. As shown in FIG. 8, the inner diameter 621a of the large diameter portion 621 is formed to have a diameter slightly larger than the circumscribed circle of the rib 612 of the first cover component 610. Then, the large diameter portion 621 overlaps and arranges the first cover component 610 so as to cover the front end thereof. The first sliding member 710 is arranged between the first cover component 610 and the outer second cover component 620 that covers the first cover component 610 on the outer periphery of the front end of the inner first cover component 610.

A second sliding member 720 is wound around the outer periphery of the second cover component 620 on the front end side. The second sliding member 720 has substantially the same configuration as the first sliding member 710 shown in FIG. 7. That is, the second sliding member 720 has an engaging portion 721, an engaged portion 722, and a straight portion 723, and is formed in a band shape. Further, similarly to the first sliding member 710, the concave portion 722a of the engaged portion 722 has a shape corresponding to the convex portion 721a of the engaging portion 721. The second sliding member 720 is formed to have a smaller frictional resistance than the first sliding member 710 by making the material different from that of the first sliding member 710.

An operation knob 622 is provided on the outer peripheral surface of the second cover component 620. The operation knob 622 projects in the outer diameter direction of the second cover component 620, and is fixed to the second cover component 620 by screwing. A protrusion 623 having an arcuate cross section is provided on the front end edge of the second cover component 620.

The second cover component 620 is fixed to the movable cam lens barrel 430. Therefore, the movable cam lens barrel 430 can rotate in the circumferential direction together with the second cover component 620.

Further, the second cover component 620 has a tapered guide portion 621b inclined in a substantially protruding arc at the inner edge of the rear end of the large diameter portion 621. Therefore, when the first cover component 610 is inserted into the second cover component 620 when the lens barrel cover 600 is assembled, the first sliding member 710 comes into contact with the rear end surface of the large diameter portion 621 in the insertion direction. It can be prevented from peeling off.

The third cover component 630 is formed in a substantially cylindrical shape. The inner diameter 630a of the third cover component 630 is formed to have substantially the same diameter as the inner diameter 621a of the large diameter portion 621 of the second cover component 620. As shown in FIG. 8, the second sliding member 720 includes a second cover component 620 and an outer third cover component 630 that covers the second cover component 620 on the outer periphery of the front end of the inner second cover component 620. Placed between. The third cover component 630 has a small diameter portion 631 having a reduced cylinder diameter on the front end side. On the outer peripheral side surface of the small diameter portion 631, a through hole 632 for a screw penetrating in the radial direction is formed. The through holes 632 are provided at four locations around the outer periphery at substantially equal intervals. The third cover component 630 is fixed to the focus lens 520 by being screwed to the screw hole 522 of the focus lens 520 via the through hole 632.

The opening at the front end of the third cover component 630 is sealed from the front by the lens cover 633. The lens cover 633 has a translucent property, transmits light emitted from the lens unit main body 400, and has a function of preventing dust from entering the lens unit main body 400.

An operation knob 634 is provided on the outer peripheral side surface of the third cover component 630. Since the third cover component 630 and the focus lens 520 are fixed to each other, when the operation knob 634 is rotated in the circumferential direction, the screwing depth of the male screw portion 521 changes, and the focus lens 520 with respect to the zoom lens 510 changes. The front-back position can be adjusted.

Further, a tapered guide portion 630b inclined in a substantially protruding arc is formed on the inner edge of the rear end of the third cover component 630. Therefore, when the second cover component 620 is inserted into the third cover component 630 when the lens barrel cover 600 is assembled, the second sliding member 720 comes into contact with the rear end surface of the third cover component 630 in the insertion direction. It can be prevented from peeling off.

As described above, by using the tubular cover parts in multiple stages and arranging the sliding members 710 and 720 on the outer circumference, it is possible to secure a sealed structure that does not depend on tolerances and mounting inclinations, and to manually set the lens. The position adjustment function can be secured.

Further, the shape of both ends of the strip-shaped sliding members 710 and 720 is changed to the engaging portions 711 and 721 including the convex portions 711a and 721a and the engaged portions 712 and 722 including the concave portions 712a and 722a. The 710 and 720 are brought into close contact with each other with respect to the first cover component 610, the second cover component 620 and the third cover component 630 to form a lens barrel cover 600 that is inexpensive, has good assembly workability, and secures slidability. be able to.

The zoom lens 510 and the focus lens 520, which are movable lenses, may each have one lens or a plurality of lenses.

Further, the front end of the first cover component 610 may cover the rear end of the second cover component 620. In this case, the first sliding member 710 may be wound around the outer periphery on the rear end side of the second cover member. Similarly, the front end of the second cover component 620 may cover the rear end of the third cover component 630. The second sliding member 720 may be wound around the outer periphery on the rear end side of the second cover member.

Further, in the present embodiment, the configuration in which the second cover component 620 and the third cover component 630 are manually operated by the operation knobs 622 and 634 has been described, but the second cover component 620 and the third cover component 630 are motorized. It may be configured to be automatically operated by such a drive unit.

Further, in the present embodiment, the first cover component 610 is fixed to the case 61 together with the fixed lens barrel 410, but the first cover component 610 may be configured to be relatively movable with respect to the case 61. Further, depending on the number of stages of the movable portion, a plurality of second cover parts 620 may be provided to form a multi-stage lens barrel cover 600 having four or more stages.

(Embodiment 2)
Next, the second embodiment will be described. FIG. 9A is a diagram showing a medium-width first sliding member 810 of the lens unit 200, and FIG. 9B is a diagram showing a first cover component 610 in which the medium-width first sliding member 810 is arranged. It is a figure which shows. In this embodiment, the first sliding member 810 and the second sliding member 820 are used instead of the first sliding member 710 and the second sliding member 720 of the first embodiment. In the following description, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified.

The first sliding member 810 is formed in a band shape in the deployed state shown in FIG. 9A. The first sliding member 810 has an engaging portion 811 including a convex portion 811a at a substantially center in the width direction on one end side, and an engaged portion 812 including a concave portion 812a at a substantially center in the width direction on the other end side. Have. The convex portion 811a is formed in the shape of an oblong rectangular plate. The recess 812a is formed by being cut out in an elongated rectangular shape. The recess 812a is formed so as to be surrounded by a substantially U-shaped frame portion 812b. The concave portion 812a of the engaged portion 812 has a shape corresponding to the convex portion 811a of the engaging portion 811. A linear portion 813 having a substantially constant width is formed between the engaging portion 811 and the engaged portion 812. The width of the straight portion 813 is formed wider than the width of the convex portion 811a. Further, the width of the straight line portion 813 is formed to be narrower than the width of the frame portion 812b. The first sliding member 810 has a layered structure made of a base material, a flexible member, and an adhesive, similarly to the first sliding member 710 of the first embodiment.

As shown in FIG. 9B, the first sliding member 810 is provided in the first cover component 610 instead of the first sliding member 710 shown in the first embodiment.

FIG. 10A is a developed view of the narrow second sliding member 820 of the lens unit, and FIG. 10B is a diagram showing a second cover component 620 in which the narrow second sliding member 820 is arranged. Is.

The second sliding member 820 is formed in a band shape in the deployed state shown in FIG. 10 (a). The second sliding member 820 has an engaging portion 821 including a convex portion 821a on the central side in the width direction on one end side, and an engaged portion 822 including a concave portion 822a in substantially the center on the other end side in the width direction. Have. The convex portion 821a is formed in a long rectangular shape. The recess 822a is formed by being cut out in an elongated rectangular shape. The recess 822a is formed so as to be surrounded by a substantially U-shaped frame portion 822b. The concave portion 822a of the engaged portion 822 has a shape corresponding to the convex portion 811a of the engaging portion 821. A linear portion 823 having a substantially constant width is formed between the engaging portion 821 and the engaged portion 822. The width of the straight portion 823 is substantially the same as the width of the frame portion 822b. The second sliding member 820 also has a layered structure made of a base material, a flexible member, and an adhesive, like the second sliding member 720 of the first embodiment.

As shown in FIG. 10B, the second sliding member 820 is provided on the second cover component 620 instead of the second sliding member 720 shown in the first embodiment.

In the present embodiment, an example in which the first sliding member and the second sliding member have sliding members having different widths of straight portions has been described. As a result, the frictional resistance between the first cover part 610 and the second cover part 620 becomes larger than the frictional resistance between the second cover part 620 and the third cover part 630. The portion in contact between the second cover component 620 and the first cover component 610 does not slip, and the portion in contact with the second cover component 620 and the third cover component 630 slides, so that only the focus lens 520 can be operated. Therefore, the zoom lens 510 and the focus lens 520 can be operated individually.

As described above, in each embodiment, the sliding members 710, 810, 720, 820 having different widths of the straight portions are shown, but the engaging portions 711,721,811,821 and the engaged portions 712,722,821,822 are shown. You may change the shape of. For example, the convex portions 711a, 721a, 811a, 821a are defined as triangular, crank, curved, T-shaped, L-shaped, etc., and the convex portions 711a, 721a, 811a, 821a are recessed 712a, 722a, 812a. , 822a may be engaged with the groove so as not to come off even if it is urged in the width direction. When the engaging portions 711,721,811,821 are engaged with the engaged portions 712,722,812,822, they are in close contact with each other so as to be sandwiched between the recesses 712a, 722a, 812a, 822a depending on the width direction. , Formed in a shape that adheres or loosely fits in the length direction.

The first sliding member 710, 810 and the second sliding member 720, 820 may be attached to the first cover component 610 or the second cover component 620 by using an adhesive instead of the adhesive or by other fixing method. Can be fixed.

Further, if the rotation resistance of the third cover component 630 is lower than that of the second cover component 620, the zoom lens 510 and the focus lens 520 can be operated individually. When a method of lowering the frictional resistance of the second sliding member 720 than that of the first sliding member 710 is adopted, the thickness of the first sliding member 710 is made thinner than that of the second sliding member 720, and the frictional resistance is reduced. May be adjusted. Further, as shown in the second embodiment, the width of the straight portion 813 of the first sliding member 810 may be wider than that of the straight portion 823 of the second sliding member 820. Further, as in the first embodiment, the material of the first sliding member 710 may be made of a material having a larger frictional resistance than the second sliding member 720.

Further, in order to make the frictional resistance of the first sliding member 710 higher than the frictional resistance of the second sliding member 720, the sliding member having the same shape and material is first placed with respect to the position of the second sliding member 720. Many may be arranged at the position of the sliding member 710. For example, two or more second sliding members 820 having a thin straight line portion 823 as shown in the second embodiment may be arranged at the position of the first sliding member 810.

(Modification example)
In the above-described embodiment, only the frictional resistance at the overlapping portion of the first cover component 610, the second cover component 620, and the third cover component 630 is considered, but each mirror of the lens unit main body 400 is illustrated. It is configured to take into account the frictional resistance generated between the tubular members.

For example, the first sliding member 710 and the first sliding member 710 and the first sliding member 710 according to the value of the frictional resistance generated between the fixed lens barrel 410, the straight guide lens barrel 420, the movable cam lens barrel 430, and the forward movable lens barrel 440, which are the first lens components. 2 It is configured to adjust the frictional resistance value of the sliding member 720.

Here, the frictional resistance value generated in the lens unit is defined as follows. Let A be the frictional resistance value generated between the third cover part 630 and the second cover part 620, and let B be the frictional resistance value generated between the second cover part 620 and the first cover part 610. Further, the frictional resistance value generated between the straight guide lens barrel 420 and the movable cam lens barrel 430 is a, and the frictional resistance value generated between the forward movable lens barrel 440 and the straight guide lens barrel 420 is b.

In the configuration of the second embodiment, since the frictional resistance generated in the lens unit main body 400 is not taken into consideration, A <B is configured. However, when the frictional resistance value generated in the lens unit main body 400 is taken into consideration, A <B + b. The frictional resistance of the first sliding member and the second sliding member may be set so as to have the relationship of.

By adjusting the value of the frictional resistance generated between the lens barrels of the lens unit main body 400 as described above, it is possible to solve the problem that the focus lens cannot be operated independently.

Further, an example in which the first sliding member and the second sliding member have sliding members having different widths of the straight portion has been described. A plurality of dummy portions (pressure distribution portions) having the same width as the convex portions and the concave portions may be formed so as to be evenly spaced when the concave portions are fitted. With this configuration, the pressure bias between the first cover component and the second cover component caused by the difference in width between the straight portion and the convex portion and the concave portion can be evenly dispersed. When three dummy portions are formed on the straight portion at equal intervals, the pressure applied to the sliding member is evenly distributed on the circumference of the cover component. Further, the magnitude of the frictional resistance of the first sliding member and the second sliding member may be changed depending on the width of the dummy portion.

Further, in the present embodiment, when the sliding members 710 and 810 are arranged between the first cover component 610 and the second cover component 620, the inner first cover component 610 has the first cylinder portion substantially as a whole. However, the outer second cover component 620 has a second tubular portion that covers a part of the inner first cover component 610. Alternatively, when the sliding members 720 and 820 are arranged between the second cover component 620 and the third cover component 630, the inner second cover component 620 has the first cylinder portion substantially as a whole, and the outer second cover component 620 has a first cylinder portion. 3 The cover component 630 has a second cylinder portion substantially as a whole. However, each cover component 610, 620, 630 may have a tubular portion in a part thereof, and the first tubular portion is formed in a part of the inner first cover component 610 or the second cover component 620, and the second cover component is formed. The tubular portion may be formed on a part of the outer second cover component 620 or the third cover component 630.

As described above, the lens barrel cover 600 of the present embodiment covers the first lens component (fixed lens barrel 410) and is fixed to the first lens component with respect to the tubular first cover component 610 and the first lens component. A tubular second cover component 620 that covers the movable second lens component (movable cam lens barrel 430), is fixed to the second lens component, and is arranged so as to overlap the front end of the first cover component 610. A tubular third cover component that covers a third lens component (focus lens 520) that can be moved with respect to the two lens components, is fixed to the third lens component, and is arranged so as to overlap the front end of the second cover component 620. The 630, the first sliding member 710 arranged between the first cover part 610 and the second cover part 620, and the first sliding member arranged between the second cover part 620 and the third cover part 630. A second sliding member 720 having a frictional resistance different from that of the moving member 710 is provided.

Therefore, by sealing the gap between the parts with a sliding member having high slidability and airtightness, the cylindrical cover part can be used in multiple stages, and both slidability and dustproofness can be achieved. Therefore, it is possible to provide a lens barrel cover 600, a lens unit 200, and a projection device 10 that enhance slidability while preventing foreign matter from entering.

Further, the lens barrel cover 600 in which the second sliding member 720 has a smaller frictional resistance than the first sliding member 710 does not depend on the operating resistance between the first lens component, the second lens component, and the third lens component, and is second. 2 The rotational resistance of the lens component can be made lower than that of the first lens component.

Further, the rear end of the second cover component 620 covers the front end of the first cover component 610, the rear end of the third cover component 630 covers the front end of the second cover component 620, and the first sliding member 710 covers the first cover. The lens barrel cover 600, which is arranged on the outer periphery of the front end of the component 610 and the second sliding member 720 is arranged on the outer periphery of the front end of the second cover component 620, is the front end of the third cover component 630 arranged on the front side. Since the outer diameter can be reduced, it is possible to reduce the deformation of the lens barrel cover 600 supported in a cantilever shape due to bending or the like due to the weight of the tip.

Further, the lens barrel cover 600 in which the inner edges of the rear end of the second cover component 620 and the rear end of the third cover component 630 are formed in a tapered shape can facilitate the assembly of the lens barrel cover 600.

Further, the lens unit 200 in which the first cover component 610 is fixed to the opening 61b of the optical path formed in the enclosed space and the third cover component 630 is sealed at the front end by a transparent lens cover 633 is optical. An optical path can be formed while ensuring dust resistance in the axial direction.

Further, the first lens component is a fixed lens barrel 410, the second lens component is a movable lens barrel (movable cam lens barrel 430) that can move in the front-rear direction and the circumferential direction with respect to the first lens component, and the third lens component. The lens unit 200 is a movable lens (focus lens 520) in which the lens component can move in the front-rear direction and the circumferential direction with respect to the second lens component. The lens unit 200 has a plurality of movable lenses inside while having dust resistance and slidability. Can be provided.

It should be noted that each of the embodiments described above is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

The inventions described in the first claims of the present application are described below.
[1] Case and
A lens unit main body having a first lens component, a second lens component, and a third lens component and fixed to the case via the first lens component.
A first cover component including a tubular portion that covers the rear end of the first lens component and is fixed to the case.
The second lens component that is movable with respect to the first lens component is covered and fixed to the second lens component, and the rear end thereof is arranged so as to overlap with the front end of the first cover component via the first sliding member. The tubular second cover part to be made and
The third lens component, which is movable with respect to the first lens component, is covered and fixed to the third lens component, and the rear end thereof is arranged so as to overlap with the front end of the second cover component via the second sliding member. The cylindrical third cover part to be made, and
A lens unit characterized in that the sliding resistance of the second cover component with respect to the first cover component is larger than the sliding resistance of the third cover component with respect to the second cover component.
[2] The lens unit according to the above [1], wherein the second sliding member has a smaller frictional resistance than the first sliding member.
[3] The first sliding member is arranged on the outer periphery of the front end of the first cover component.
The second sliding member is arranged on the outer periphery of the front end of the second cover component.
The lens unit according to the above [1] or the above [2].
[4] The lens unit according to the above [3], wherein the rear end of the second cover component and the inner edge of the rear end of the third cover component are formed in a tapered shape.
[5] The first cover component is fixed to an opening of an optical path formed in a closed space.
The third cover component is sealed with a translucent lens cover at the front end.
The lens unit according to any one of the above [1] to [4].
[6] The first lens component is a fixed lens barrel.
The second lens component is a movable lens barrel that can move in the front-rear direction and the circumferential direction with respect to the first lens component.
The third lens component is a movable lens that can move in the front-rear direction and the circumferential direction with respect to the second lens component.
The lens unit according to any one of the above [1] to [5].
[7] The lens unit according to any one of the above [1] to [6] and the lens unit.
Light source device and
A display element that is irradiated with light from the light source from the light source device to form image light, and
A projection device control unit that controls the display element and the light source device,
Have,
The lens unit projects the image light emitted from the display element onto a screen.
A projection device characterized by that.

10 Projection device 10a Upper body case 10b Lower body case 11 Top panel 11a Projection image adjustment unit 12 Front panel 12a Light emission unit 12b Projection port 12c Height adjustment button 13 Back panel 14 Right panel 15 Left panel 19 Lens cover 20 Terminal 21 Output connector 22 Input / output interface 23 Image conversion 24 Display encoder 25 Video RAM 26 Display drive 31 Image compression / decompression 32 Memory card 35 Ir receiver 36 Ir processing 37 Key / indicator 38 Control 41 Light source control circuit 43 Cooling fan drive control circuit 47 Audio processing unit 48 Speaker 51 Display element 60 Light source device 61 Case 61a Opening 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 74 Holder 76 Reflection mirror 78 Diffuse plate 80 Green light source device 81 Heat sink 100 Fluorescent plate device 101 Fluorescent plate 110 Motor 115 Condensing lens 117a Condensing lens 117b Condensing lens 120 Red light source device 121 Red light source 125 Condensing lens group 130 Heat sink 140 Light guide optical system 141 First dichroic mirror 143 First reflection mirror 145 Second Reflection mirror 146 Condensing lens 147 Condensing lens 148 Second dichroic mirror 149 Condensing lens 170 Light source side optical system 173 Condensing lens 175 Light guide device 178 Condensing lens 179 Optical axis conversion mirror 183 Condensing lens 185 Irradiation mirror 190 Heat sink 191 Fin 195 Condenser lens 200 Lens unit 220 Projection side optical system 260 Intake fan 270 Intake fan 280 Exhaust fan 301 Power supply device 302 Control circuit board 310 Intake hole 320 Intake hole 330 Intake hole 340 Exhaust hole 400 Lens unit body 410 Fixed lens barrel 411 Flange 411a Through hole 411b Through hole 412 Cylindrical part 412a Inner peripheral rib 420 Straight guide lens tube 421 Stop protrusion 422 Through hole 423 Screw hole 424 Engagement groove 430 Movable cam lens tube 431a Cam groove 431b Cam groove 432 Rotating groove 440 Forward Movable lens barrel 441 Projection 441a Screw hole 441b Camforor 442 Female screw part 501 Corner part 503 Corner part 504 Corner part 510 Zoom lens 511 Projection Raising part 511a Screw hole 511b Cam follower 520 Focus lens 521 Male screw part 522 Screw hole 600 Lens tube cover 610 First cover part 611 Flange part 611a Through hole 612 Rib 620 Second cover part 621 Large diameter part 621a Inner diameter 621b Guide part 622 Knob 623 Protrusion 630 Third cover part 630a Inner diameter 630b Guide part 631 Small diameter part 632 Through hole 633 Lens cover 634 Operation knob 710 First sliding member 711 Engagement part 711a Convex part 712 Engagement part 712a Concave part 712b Frame part 713 Straight line Part 720 Second sliding member 721 Engagement part 721a Convex part 722 Engagement part 722a Recessed part 723 Straight part 810 First sliding member 811 Engagement part 811a Convex part 812 Engagement part 812a Recessed part 812b Frame part 813 Straight part 820 Second sliding member 821 Engagement part 821a Convex part 822 Engagement part 822a Concave part 822b Frame part 823 Straight part S1 Screw S2 Screw

The lens unit according to the present invention has a case, a first lens component, a second lens component, and a third lens component, and has a lens unit main body fixed to the case via the first lens component, and the lens unit body. The first cover component including the tubular portion that covers the rear end of the first lens component and is fixed to the case, and the second lens component that is movable with respect to the first lens component are covered by the second lens component. A tubular second cover component that is fixed and whose rear end is overlapped with the front end of the first cover component via a first sliding member, and the first lens component that is movable with respect to the first lens component. covering the third lens component being fixed to the third lens component, and a cylindrical third cover part are arranged to overlap over the front end and a second sliding member of the rear end the second cover component the sliding resistance of the second cover component relative to the first cover part, second cover rather greater than the sliding resistance of the third cover part with respect to parts, the front end and the second cover part of the first cover component The band-shaped first sliding member is provided so as to slide while contacting the rear end, and slides while contacting the front end of the second cover component and the rear end of the third cover component. The band-shaped second sliding member is provided so as to be provided, and the first sliding member and the second sliding member have a sliding member having the same shape and material, and the first sliding member. The number of the sliding members of the second sliding member is larger than the number of the sliding members of the second sliding member .

Claims (7)

With the case
A lens unit main body having a first lens component, a second lens component, and a third lens component and fixed to the case via the first lens component.
A first cover component including a tubular portion that covers the rear end of the first lens component and is fixed to the case.
The second lens component that is movable with respect to the first lens component is covered and fixed to the second lens component, and the rear end thereof is arranged so as to overlap with the front end of the first cover component via the first sliding member. The tubular second cover part to be made and
The third lens component, which is movable with respect to the first lens component, is covered and fixed to the third lens component, and the rear end thereof is arranged so as to overlap with the front end of the second cover component via the second sliding member. The cylindrical third cover part to be made, and
A lens unit characterized in that the sliding resistance of the second cover component with respect to the first cover component is larger than the sliding resistance of the third cover component with respect to the second cover component. The lens unit according to claim 1, wherein the second sliding member has a smaller frictional resistance than the first sliding member. The first sliding member is arranged on the outer periphery of the front end of the first cover component.
The second sliding member is arranged on the outer periphery of the front end of the second cover component.
The lens unit according to claim 1 or 2, wherein the lens unit is characterized in that. The lens unit according to claim 3, wherein the rear end of the second cover component and the inner edge of the rear end of the third cover component are formed in a tapered shape. The first cover component is fixed to an opening of an optical path formed in a closed space.
The third cover component is sealed with a translucent lens cover at the front end.
The lens unit according to any one of claims 1 to 4. The first lens component is a fixed lens barrel.
The second lens component is a movable lens barrel that can move in the front-rear direction and the circumferential direction with respect to the first lens component.
The third lens component is a movable lens that can move in the front-rear direction and the circumferential direction with respect to the second lens component.
The lens unit according to any one of claims 1 to 5. The lens unit according to any one of claims 1 to 6 and the lens unit.
Light source device and
A display element that is irradiated with light from the light source from the light source device to form image light, and
A projection device control unit that controls the display element and the light source device,
Have,
The lens unit projects the image light emitted from the display element onto a screen.
A projection device characterized by that.

Images