JP5812332B2 - Fixing the projection lens unit - Google Patents

Description

The present invention relates to a method for fixing the projecting shadow lens unit.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate, and displays a color image on a screen.

  2. Description of the Related Art A projector is known that is manufactured by attaching a projection lens unit as a projection-side optical system to a display element unit that includes a display element when the projector is manufactured. The projection lens unit has a fixed cylinder and a movable cylinder in which a fixed lens group and a movable lens group are arranged, and the movable cylinder is slidably attached to the fixed cylinder. The projection lens unit has a structure capable of zoom adjustment and focus adjustment by moving the movable lens group along the optical axis direction when the movable cylinder is rotated with respect to the fixed cylinder about the optical axis.

  In the display element unit including the display element described above, the flange back, which is the distance from the display element to the mounting surface of the projection lens unit, may deviate from the set reference value. The cause of this deviation includes manufacturing tolerances such as mounting of mechanical parts and display elements.

  If the projection lens unit is provided in the display element unit in a state where the flange back is deviated from the set reference value, the reference position of the focus adjustment range by the projection lens unit is deviated. For this reason, when manufacturing the projector, a step of arranging a spacer having a predetermined thickness between the display element unit and the projection lens unit is required so that the flange back becomes the set reference value. Specifically, a spacer having a predetermined thickness is selected from a plurality of spacers having different thicknesses prepared in advance, and the spacer is disposed between the display element unit and the projection lens unit.

  Incidentally, as a lens unit used in a camera for photographing or the like, Patent Document 1 discloses a lens unit provided with a distance scale display means on a sliding surface of a lens barrel.

  However, in a projection lens unit for a projector, zoom and focus adjustment are performed while viewing a projected image, and thus the zoom scale and focus scale are not provided in the projection lens unit.

JP 2001-42419 A

  In the projector manufacturing method described above, a spacer having a predetermined thickness is selected from a plurality of spacers having different thicknesses prepared in advance, and the spacer is disposed between the display element unit and the projection lens unit. There is a case where the thickness of the spacer is adjusted a plurality of times until the set reference value is reached, which causes a problem that the working efficiency is lowered.

The present invention has been made in view of the problems of the prior art as described above, and can easily adjust the flange back without performing complicated operations, making the projector easy to manufacture. and to provide a method of fixing projection shadow lens unit that can the be manufactured with low cost projector.

A method of fixing a projection lens unit according to the present invention, using a projection lens unit comprising a memory containing a reference position in the focus ring, the flange portion of the front Symbol projection lens unit, the fixed portion of the display element unit having a display device fixed via a flange back correction spacers, an image of the display element on a screen installed in the predetermined specified distance, is projected through the projection lens unit performs focus adjustment by the focus ring, the adjusted of the read focus adjustment amount from the reference position from the focus ring graduated, depending on the focus adjustment amount, to determine the thickness of the flange-back correction spacers disposed in a fixed surface of the flange portion of the projection lens unit The flange back correction spacer so as to have the determined thickness And adjusting.

According to the present invention, without performing complicated operations, simply, it can be performed to adjust the flange back, projecting shadow lens unit that can the be manufactured with low manufacturing cost projector manufacturing projector as easily A fixing method can be provided.

1 is an external perspective view showing a projector according to an embodiment of the invention. It is a figure which shows the functional block of the projector which concerns on embodiment of this invention. 1 is a schematic plan view showing an internal structure of a projector according to an embodiment of the invention. It is a perspective view of the projection lens unit and spacer of the projector which concerns on embodiment of this invention. It is an expansion perspective view of the projection lens unit of the projector which concerns on embodiment of this invention. It is a figure which shows an example of the deviation | shift amount from the marking position of the projection lens unit of the projector which concerns on embodiment of this invention. It is a graph which shows correlation with the deviation | shift amount from the reference position of the rotation angle of the focus of the projection lens unit of the projector which concerns on embodiment of this invention, and the thickness of the spacer for flange back correction | amendment. It is a flowchart which shows an example of the manufacturing method of the projector which concerns on embodiment of this invention.

  Hereinafter, modes for carrying out the present invention will be described. FIG. 1 is an external perspective view of the projector 10. In the present embodiment, left and right in the projector 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projector 10 and the front and rear direction with respect to the traveling direction of the light beam.

  As shown in FIG. 1, the projector 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a front side plate of the projector housing. The panel 12 is provided with a plurality of intake holes 18. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  In addition, a key / indicator unit 37 is provided on the top panel 11 of the housing. The key / indicator unit 37 switches a power switch key, a power indicator for notifying power on / off, and switching on / off of projection. Keys and indicators such as an overheat indicator for notifying when a projection switch key, a light source unit, a display element, a control circuit, etc. are overheated are arranged.

  In addition, on the rear surface of the housing, there are provided various terminals 20 such as an input / output connector section and a power adapter plug that provide a USB terminal, a D-SUB terminal for image signal input, an S terminal, an RCA terminal, etc. on the rear panel. Yes. In addition, a plurality of intake holes are formed in the back panel. A plurality of exhaust holes 17 are formed in each of the right panel, which is a side plate of the housing (not shown), and the left panel 15, which is the side plate shown in FIG. An intake hole 18 is also formed at a corner near the back panel of the left panel 15.

  Next, projector control means of the projector 10 will be described with reference to the functional block diagram of FIG. The projector control means includes 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 operation of each circuit in the projector 10, and includes a ROM that stores operation programs such as a CPU and various settings fixedly, and a RAM that is used as a work memory. .

  Then, the image signal of various standards input from the input / output connector unit 21 by the projector control means is 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 so as to be unified into an image signal, it is output to the display encoder 24.

  The display encoder 24 develops 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 functions as display element control means, and 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. Is. Then, the projector 10 irradiates the light beam emitted from the light source unit 60 to the display element 51 through the light guide optical system, thereby forming an optical image with the reflected light of the display element 51, and a projection described later. An image is projected and displayed on a screen (not shown) via the side optical system 220. The movable lens group 235 of the projection side optical system 220 is driven by the lens motor 45 for zoom adjustment and focus adjustment.

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

  Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, decompresses each image data constituting a series of moving images in units of one frame, and converts the image data into an image conversion Based on the image data that is output to the display encoder 24 via the unit 23 and stored in the memory card 32, processing for enabling display of a moving image or the like is performed.

  An operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the top panel 11 of the housing is directly sent to the control unit 38, and a key operation signal from the remote controller is sent to the Ir receiving unit 35. , And the code signal demodulated by the Ir processor 36 is output to the controller 38.

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

  Further, the control unit 38 controls a light source control circuit 41 as a light source control means, and the light source control circuit 41 is configured so that light of a predetermined wavelength band required at the time of image generation is emitted from the light source unit 60. The light emission of the excitation light irradiation device, the red light source device, and the blue light source device of the light source unit 60 is individually controlled.

  Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source unit 60 and the like, and controls the rotation speed of the cooling fan from the result of the temperature detection. Further, the control unit 38 causes the cooling fan drive control circuit 43 to keep the cooling fan rotating even after the projector body is turned off by a timer or the like, or to turn off the projector body depending on the result of temperature detection by the temperature sensor. Control is also performed.

  Next, the internal structure of the projector 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 10. As shown in FIG. 3, the projector 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power circuit block, a light source control block, and the like. In addition, the projector 10 includes a light source unit 60 on the side of the control circuit board 241, that is, at a substantially central portion of the projector housing. Further, the projector 10 includes an optical system unit 160 between the light source unit 60 and the left panel 15.

  The light source unit 60 includes an excitation light irradiation device 70 that is a light source device disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector housing, and a light flux emitted from the excitation light irradiation device 70. A fluorescent light emitting device 100 arranged on the optical axis and in the vicinity of the front panel 12, and a blue light source device arranged in the vicinity of the front panel 12 so as to be parallel to the light beam emitted from the fluorescent light emitting device 100 300, the red light source device 120 disposed between the excitation light irradiation device 70 and the fluorescent light emitting device 100, the emitted light from the fluorescent light emitting device 100, the emitted light from the red light source device 120, the blue light source device 300 And a light guide optical system 140 that converts the optical axes of the emitted light to the same optical axis and guides each color light to the entrance of the light tunnel 175, which is a predetermined surface.

  The excitation light irradiation device 70 includes an excitation light source 71 which is a light source element such as a laser element arranged so that the optical axis is parallel to the rear panel 13, and the optical axis of the light emitted from the excitation light source 71 in the direction of the front panel 12 A reflecting mirror group 75 that converts the light to 90 degrees, a condenser lens 78 that condenses the light emitted from the excitation light source 71 reflected by the reflection mirror group 75, and a heat sink disposed between the excitation light source 71 and the right panel 14. 81.

  The excitation light source 71 includes a total of 24 blue laser diodes in 3 rows and 8 columns arranged in a matrix. On the optical axis of each blue laser diode, the light emitted from each blue laser diode is converted into parallel light. A collimator lens 73, which is a condenser lens, is disposed. The reflection mirror group 75 includes a plurality of reflection mirrors arranged in a stepped manner, and reduces the cross-sectional area of the light beam emitted from the excitation light source 71 in one direction and emits it to the condensing lens 78.

  Two cooling fans 261 are disposed between the heat sink 81 and the back panel 13, and the excitation light source 71 is cooled by the cooling fan 261 and the heat sink 81. Further, a cooling fan 261 is also disposed between the reflection mirror group 75 and the back panel 13, and the reflection mirror group 75 and the condenser lens 78 are cooled by the cooling fan 261.

  The fluorescent light emitting device 100 is arranged so as to be parallel to the front panel 12, that is, the fluorescent wheel 101 disposed so as to be orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and the fluorescent wheel 101 is rotationally driven. And a condensing lens group 111 that condenses the light bundle emitted from the fluorescent wheel 101 toward the rear panel 13.

  The fluorescent wheel 101 is a disk-shaped metal substrate, and an annular fluorescent light emitting region that emits fluorescent light in the green wavelength band using the light emitted from the excitation light source 71 as excitation light is formed as a recess, and the excitation light And functions as a fluorescent plate that emits fluorescence. In addition, the surface of the fluorescent light wheel 101 including the fluorescent light emitting region on the side of the excitation light source 71 is mirror-processed by silver deposition or the like to form a reflective surface that reflects light, and a green phosphor layer is formed on the reflective surface. It is laid.

  The light emitted from the excitation light irradiating device 70 applied to the green phosphor layer of the fluorescent wheel 101 excites the green phosphor in the green phosphor layer, and the light bundle is emitted in all directions from the green phosphor. Is emitted directly to the excitation light source 71 side or after being reflected by the reflection surface of the fluorescent wheel 101 to the excitation light source 71 side. Moreover, the excitation light irradiated to the metal substrate without being absorbed by the phosphor of the phosphor layer is reflected by the reflecting surface and is incident on the phosphor layer again to excite the phosphor. Therefore, by using the surface of the concave portion of the fluorescent wheel 101 as a reflective surface, the utilization efficiency of the excitation light emitted from the excitation light source 71 can be increased, and the light can be emitted more brightly.

  In the excitation light reflected on the phosphor layer side by the reflecting surface of the fluorescent wheel 101, the excitation light emitted to the excitation light source 71 side without being absorbed by the phosphor passes through a first dichroic mirror 141 described later. Since the fluorescent light is reflected by the first dichroic mirror 141, the excitation light is not emitted to the outside. A cooling fan 261 is disposed between the wheel motor 110 and the front panel 12, and the fluorescent wheel 101 is cooled by the cooling fan 261.

  The red light source device 120 includes a red light source 121 disposed so that the optical axis is parallel to the excitation light source 71, and a condensing lens group 125 that condenses the light emitted from the red light source 121. The red light source device 120 is disposed so that the optical axis intersects the light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101. The red light source 121 is a red light emitting diode as a semiconductor light emitting element that emits red wavelength band light. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261.

  The blue light source device 300 includes a blue light source 301 disposed so as to be parallel to the optical axis of the light emitted from the fluorescent light emitting device 100, and a condenser lens group 305 that collects the light emitted from the blue light source 301. Prepare. The blue light source device 300 is arranged so that the light emitted from the red light source device 120 and the optical axis intersect. The blue light source 301 is a blue light emitting diode as a semiconductor light emitting element that emits light in a blue wavelength band. Furthermore, the blue light source device 300 includes a heat sink 310 disposed on the front panel 12 side of the blue light source 301. A cooling fan 261 is disposed between the heat sink 310 and the front panel 12, and the blue light source 301 is cooled by the cooling fan 261.

  The light guide optical system 140 is a condensing lens that condenses the light bundles in the red, green, and blue wavelength bands, a dichroic mirror that converts the optical axes of the light bundles in the respective color wavelength bands into the same optical axis, etc. Consists of. Specifically, the optical axis of the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101, and the optical axis of the red wavelength band light emitted from the red light source device 120 The first dichroic mirror 141 that transmits the blue and red wavelength band light, reflects the green wavelength band light, and converts the optical axis of the green light by 90 degrees toward the left panel 15 is disposed at the position where ing.

  Further, the blue wavelength band light is transmitted at a position where the optical axis of the blue wavelength band light emitted from the blue light source device 300 and the optical axis of the red wavelength band light emitted from the red light source device 120 intersect, A second dichroic mirror 148 that reflects green and red wavelength band light and converts the optical axes of the green and red light in the direction of the rear panel 13 by 90 degrees is disposed. A condensing lens is disposed between the first dichroic mirror 141 and the second dichroic mirror 148. Further, in the vicinity of the light tunnel 175, a condenser lens 173 that condenses the light source light at the entrance of the light tunnel 175 is disposed.

  The optical system unit 160 includes an illumination side block 161 located on the left side of the excitation light irradiation device 70, an image generation block 165 located near a position where the back panel 13 and the left panel 15 intersect, and a light guide optical system. The projection-side block 168 located between the 140 and the left panel 15 is configured in a substantially U-shape.

  The illumination side block 161 includes a part of the light source side optical system 170 that guides the light source light emitted from the light source unit 60 to the display element 51 provided in the image generation block 165. The light source side optical system 170 included in the illumination side block 161 includes a light tunnel 175 that uses a light beam emitted from the light source unit 60 as a light flux having a uniform intensity distribution, and a light collecting unit that collects light emitted from the light tunnel 175. There are an optical lens 178, an optical axis conversion mirror 181 that converts the optical axis of the light beam emitted from the light tunnel 175 in the direction of the image generation block 165, and the like.

  As the light source side optical system 170, the image generation block 165 includes a condenser lens 183 that condenses the light source light reflected by the optical axis conversion mirror 181 on the display element 51, and a light beam that has passed through the condenser lens 183 as a display element. And an irradiation mirror 185 that irradiates 51 at a predetermined angle.

  Further, the image generation block 165 includes a DMD as the display element 51 attached to the display element unit 420, and a heat sink 190 for cooling the display element 51 is provided between the display element 51 and the back panel 13. The display element 51 is cooled by the heat sink 190. Further, a condensing lens 195 as the projection-side optical system 220 is disposed in the vicinity of the front surface of the display element 51.

  In the display element unit 420 of this embodiment, a display element 51, which is a DMD, a condenser lens 183, a condenser lens 195, and an irradiation mirror 185 are arranged in a frame 420a fixed to the projector main body. Yes.

  The projection-side block 168 has a lens group of the projection-side optical system 220 that emits ON light reflected by the display element 51 to the screen. Specifically, the projection-side optical system 220 has a fixed cylinder 411 and a movable cylinder 415 that incorporate a fixed lens group 225 and a movable lens group 235 as a projection lens unit 410, and a variable focus lens having a zoom function. This is an inner zoom type projection lens. This projection lens unit 410 has a function of performing zoom adjustment and focus adjustment by moving the movable lens group 235 in the optical axis direction by sliding and rotating the movable cylinder 415 with respect to the fixed cylinder 411 by the lens motor 45. Have.

  In the present embodiment, description of zoom adjustment is omitted, and the movable cylinder 415 is described as a focus adjustment movable cylinder 415 that is a focus ring. The movable lens group 235 is moved in the optical axis direction by slidingly rotating the focus adjusting movable cylinder 415 with respect to the fixed cylinder 411, thereby enabling focus adjustment. The fixed cylinder 411 of the projection lens unit 410 is fixed to the mounting portion 420b of the frame 420a of the display element unit 420 via a spacer 430 having a predetermined thickness.

  The thickness of the spacer 430 is defined such that the flange back 90, which is the distance from the display element 51 to the mounting surface of the fixed cylinder 411 of the projection lens unit 410, becomes a set reference value.

  FIG. 4 is a perspective view of the projection lens unit 410 and the spacer 430 as the lens unit of the projector 10 according to the embodiment of the invention. FIG. 5 is an enlarged perspective view of the projection lens unit 410.

  As shown in FIG. 4, the projector 10 according to the embodiment of the present invention includes a projection lens unit 410, a display element unit 420, and a spacer 430. The fixed cylinder 411 of the projection lens unit 410 is fixed to a lens unit fixing portion, which is a mounting portion 420b of the frame 420a of the display element unit 420, by a fixing member 601 such as a screw, with a spacer 430 having a predetermined thickness interposed therebetween. ing.

  The projection lens unit 410 has a fixed cylinder 411 as a fixed part, and a movable cylinder 415 for focus adjustment, which is a movable part that engages the fixed cylinder 411 so as to be rotatable and slidable around the optical axis as a central axis. The movable cylinder 415 functions as a focus unit. The fixed cylinder 411 and the movable cylinder 415 incorporate a fixed lens group 225 and a movable lens group 235. The projection lens unit 410 is configured such that the movable lens group 235 can be moved back and forth in the optical axis direction by rotating the movable cylinder 415, so that the focus can be adjusted.

  As shown in FIGS. 4 and 5, the fixed cylinder 411 has a flange 412 that protrudes outward in the left-right direction from the outer peripheral edge near the center of the cylindrical main body 411 a. The flange 412 has a hole 412a into which a fixing member 601 such as a screw is inserted, and the fixing cylinder 411 is fixed to the mounting portion 420b of the frame 420a by the fixing member 601 through a spacer 430 having a predetermined thickness.

  The fixed cylinder 411 has a small-diameter cylindrical portion 411b on the movable cylinder 415 side and on the light emission side. The small diameter cylindrical portion 411b has an outer diameter smaller than that of the cylindrical main body portion 411a. Further, the small diameter cylindrical portion 411b is formed to have a smaller diameter than the outer diameter of the movable cylinder 415. A plurality of grooves 411c and a plurality of protrusions 411d are alternately formed along the circumferential direction at predetermined intervals on a part of the outer periphery of the small-diameter cylindrical portion 411b. In the present embodiment, the plurality of groove portions 411c and the protruding portions 411d are formed in a predetermined range of about 45 ° left and right along the circumferential direction on the upper side of the outer periphery of the small-diameter cylindrical portion 411b.

  As shown in FIG. 4, the movable cylinder 415 is formed to have a larger diameter than the small-diameter cylindrical portion 411b of the fixed cylinder 411, and the fixed cylinder 411 is located near the end opposite to the light emission direction. The end portion of the small-diameter cylindrical portion 411b of 411 has a structure engaged slidably in the circumferential direction around the optical axis. A large-diameter external tooth portion 415a is formed at the outer peripheral central portion of the movable cylinder 415, and the external tooth portion 415a is configured to mesh with a gear (not shown) provided on the rotation shaft of the lens motor 45. Yes. As described above, the movable cylinder 415 rotates the movable cylinder 415 around the optical axis with respect to the fixed cylinder 411 by driving the lens motor 45, thereby moving the built-in movable lens group 235 along the optical axis direction. It is configured to be movable.

  Further, as shown in FIG. 5, a plurality of groove portions 415c and projections 415d are formed at regular intervals along the circumferential direction on the end surface 415b of the movable tube 415 on the fixed tube 411 side. The prescribed intervals along the circumferential direction of the plurality of groove portions 415c and the protruding portions 415d are formed to be the same as the intervals along the circumferential direction of the groove portions 411c and the protruding portions 411d formed in the fixed cylinder 411.

  As shown in FIGS. 5 and 6, the plurality of grooves 411c and the protrusions 411d of the fixed cylinder 411 function as a scale 411e that can visually identify the shift amount 501 from the reference position of the focus adjustment range. Similarly, the plurality of grooves 415c and the protrusions 415d of the movable cylinder 415 function as the scale 415e. Scales 411e and 415e as focus scales are provided on either or either one of the fixed cylinder 411 and the movable cylinder 415 for focus adjustment.

  The groove 411c and the protrusion 411d of the fixed cylinder 411 and the groove 415c and the protrusion 415d of the movable cylinder 415 are formed by a predetermined manufacturing method such as injection molding.

  In addition, any one of the plurality of grooves 411c and the protrusions 411d of the fixed cylinder 411 and any one of the plurality of grooves 415c and the protrusions 415d of the movable cylinder 415 are subjected to focus adjustment by a marking process. A mark 411m and a mark 415m indicating the reference position of the range are formed. For example, as shown in FIG. 5, the marks 411m and 415m are formed so as to be arranged on a straight line along the optical axis direction. The marks 411m and 415m are formed by, for example, application of oil-based ink, pasting of a sealing material, notch processing, or the like.

  Further, in the present embodiment, one scale of the scales 411e and 415e of the fixed cylinder 411 and the movable cylinder 415 corresponds to a specified unit length related to the thickness of the spacer 430 for correcting the flange back 90, for example, a deviation of 0.1 mm. It is formed to do. In other words, from the shift amount 501 with the unit of the scales 411e and 415e of the rotation angle along the circumferential direction around the optical axis of the movable cylinder 415 with respect to the fixed cylinder 411 by the focus adjustment, for example, with a specified thickness of 0.3 mm The scales 411e and 415e of the fixed cylinder 411 and the movable cylinder 415 are configured so that the correction spacer 430 having a different thickness with respect to a certain spacer 430 can be easily converted.

  The spacer 430 is made of a predetermined material such as aluminum. As the spacer 430, a spacer having a plurality of thicknesses is prepared. For example, a spacer 430 having a thickness of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm or the like is prepared. The plurality of spacers 430 having different thicknesses are prepared in units of 0.1 mm, for example. As described above, the thickness of the spacer 430 is configured to correspond to 0.1 mm and one unit of the scales 411e and 415e relating to the rotation angle formed in the fixed cylinder 411 and the movable cylinder 415.

  In the present embodiment, the specified thickness serving as a reference for the spacer 430 is set to 0.3 mm. The spacer 430 for testing with the specified thickness is disposed between the display element unit 420 and the projection lens unit 410 of the master projector in the marking process when manufacturing the projector. The spacer 430 has a hole 430a into which the fixing member 601 is inserted.

  FIG. 7 is a conversion table in which the shift amount 501 from the reference position of the focus rotation angle of the projection lens unit 410 of the projector according to the embodiment of the present invention and the thickness of the correction spacer 430 are associated with each other. It is a graph which shows an example.

  In the present embodiment, as shown in FIG. 7, a correlation table between the focus scale of the projection lens unit 410 and the flange back 90 is created in advance as a table 500 that is a conversion table. Specifically, the table 500 which is a conversion table includes a deviation amount 501 from the reference position of the rotation angle of the focus adjustment movable cylinder 415 which is a focus ring, and a thickness of the spacer 430 to be inserted for correction of the flange back 90. And are related.

  For example, when the shift amount 501 is -3, -2, -1, 0, 1, 2, 3 (scale), the thickness of the correction spacer 430 to be inserted is 0 mm, 0.1 mm, and 0.2 mm, respectively. , 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm. Specifically, for example, when the deviation amount 501 is 0 (scale), a spacer 430 having a thickness of 0.3 mm is disposed between the display element unit 420 and the projection lens unit 410.

  For example, when the deviation amount 501 is 1 (scale), a spacer 430 having a thickness of 0.4 mm is disposed between the display element unit 420 and the projection lens unit 410. For example, when the shift amount 501 is −1 (scale), a spacer 430 having a thickness of 0.2 mm is disposed between the display element unit 420 and the projection lens unit 410. By using the spacer 430 for correcting the thickness determined in this way, the flange back 90 of the projector 10 for manufacturing can be set as the set reference value.

  Next, an example of a method for manufacturing the projector 10 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a flowchart illustrating an example of a method for manufacturing the projector 10.

  First, the projection lens unit 410 to be marked is marked (step S101). Specifically, the projection lens unit 410 to be marked is attached to the display element unit 420 of the master projector via a test spacer 430 having a specified thickness, which is a temporary spacer. The master projector is manufactured such that the flange back 90 becomes the set reference value in a state where the spacer 430 having a specified thickness is attached to the display element unit 420. As the spacer 430 having the specified thickness, for example, a spacer 430 having a thickness of 0.3 mm is employed.

  Next, the test image is projected from the master projector onto a screen separated by a specified distance, and the movable cylinder 415 of the projection lens unit 410 to be marked is slid in the circumferential direction with respect to the fixed cylinder 411 with the optical axis as the rotation axis. By moving, the focus adjustment of the projection lens unit 410 is performed. Then, the relative positional relationship between the movable cylinder 415 and the fixed cylinder 411 is specified in a state where the test image has a specified size and the best image quality on the screen. With respect to the relative positional relationship between the movable cylinder 415 and the fixed cylinder 411, the projection lens unit 410 is the reference position of the focus adjustment range.

  Next, in a state where the focus is adjusted, in order to visually identify the relative positional relationship between the movable cylinder 415 and the fixed cylinder 411, the fixed cylinder 411 and the movable cylinder 415 of the projection lens unit 410 are marked 411m, A marking process for forming 415 m is performed (step S101).

  Specifically, the marks 411m and 415m are arranged in a straight line along the optical axis direction on the fixed cylinder 411 and the movable cylinder 415, and a plurality of grooves 411c and 415c and protrusions of the fixed cylinder 411 and the movable cylinder 415. It is formed in any of the parts 411d and 415d. At this time, the marking positions of the mark 411m and the mark 415m are preferably formed at substantially the center of a predetermined range where the scales 411e and 415e of the fixed cylinder 411 or the movable cylinder 415 are formed. The linear marks 411m and 415m are formed by, for example, application of oil-based ink, application of a sealing material, notch processing, and the like.

  Next, in step S105, the projector 10 to be manufactured in a state where the projection lens unit 410 is not attached to the display element unit 420 is prepared. Then, the marked projection lens unit 410 is attached not to the master projector but to the display element unit 420 of the projector 10 to be manufactured via a spacer 430 having a specified thickness. The flange back 90 of the projector 10 to be manufactured is deviated from the set reference value due to manufacturing tolerances of the mechanical parts of the display element unit 420, manufacturing tolerances of the projector 10 such as a mounting position of the display element 51 which is a DMD, and the like. ing. The spacer 430 having the specified thickness is the same as the thickness of the test spacer 430 in step S101, for example, 0.3 mm.

  Next, in step S110, the amount of focus shift 501 of the projector 10 to which the projection lens unit 410 is attached is specified. Specifically, the test image is projected onto a screen that is a predetermined distance away from the projector 10 so that the test image has a predetermined size on the screen. The focus position is adjusted by rotating the movable cylinder 415 with respect to the fixed cylinder 411 in the circumferential direction about the optical axis so that the test image projected on the screen has the best image quality. Then, the deviation amount 501 from the marking position, which is the rotation angle between the fixed cylinder 411 and the movable portion 415, is specified. The shift amount 501 that is the rotation angle corresponds to a shift from the set reference value of the flange back 90 of the display element unit 420.

  At this time, for example, when the focus position is not shifted from the reference position, that is, when the shift amount 501 is zero with respect to the marking position, as shown in FIG. The marks 411m are arranged on a straight line.

  Further, when the focus position is deviated from the reference position, that is, when the deviation amount 501 is not zero with respect to the marking position, as shown in FIG. 6, the mark 415m of the movable cylinder 415 and the fixed cylinder 411 The mark 411m is not aligned on the straight line but is shifted. Specifically, the shift amount 501 of the mark 415m of the movable cylinder 415 is specified with one mark of the scales 411e and 415e as one unit on the basis of the mark 411m of the fixed cylinder 411.

  In this embodiment, as shown in FIG. 6, when the movable cylinder 415 side is set as the light emission direction with the fixed cylinder 411 as a reference, the left and right are defined as the left and right when the light emission direction is the front. The positive deviation amount 501 is a deviation amount when the movable cylinder 415 rotates counterclockwise with respect to the fixed cylinder 411, and the negative deviation amount 501 is a deviation when the movable cylinder 415 rotates clockwise with respect to the fixed cylinder 411. Amount.

  Further, the interval along the circumferential direction of the plurality of groove portions 411c or the protrusions 411d formed in the fixed cylinder 411 and the movable cylinder 415 is a unit of the shift amount 501 of the rotation angle of the movable cylinder 415 with respect to the fixed cylinder 411. This corresponds to one scale and corresponds to a specified length related to the flange back 90, for example, a deviation of 0.1 mm.

  Next, in step S115, for correcting the flange back 90 based on the deviation 501 from the marking position of the movable cylinder 415 with respect to the identified fixed cylinder 411 or the table 500 which is the conversion table shown in FIG. The thickness of the spacer 430 is determined.

  Specifically, for example, when the relationship between the shift amount 501 from the marking position of the movable tube 415 for focus adjustment with respect to the fixed tube 411 and the thickness of the spacer 430 for correcting the flange back 90 is a linear relationship, From the deviation amount 501 from the marking position of the movable cylinder 415, the thickness of the correction spacer 430 can be directly determined. Specifically, a correction spacer 430 having a thickness different from that of the provisional spacer 430, which is a temporary spacer, by a numerical value obtained by multiplying the number of scales of the shift amount 501 that is the focus adjustment amount by 0.1 mm. Use. In this way, the thickness of the correction spacer 430 can be easily and directly determined.

  In addition, when the relationship between the shift amount 501 from the marking position of the movable cylinder 415 for focus adjustment with respect to the fixed cylinder 411 and the thickness of the spacer 430 for correction of the flange back 90 is not linear, it was created in advance. With reference to the table 500 which is a conversion table, the thickness of the correction spacer 430 corresponding to the shift amount 501 from the marking position of the movable cylinder 415 is determined. By doing so, it is possible to easily determine the thickness of the correction spacer 430 corresponding to the shift amount 501 with reference to the table 500 which is a conversion table.

  Specifically, for example, when the deviation amount 501 is 1 (scale), the thickness of the correction spacer 430 is determined as 0.4 mm with reference to the table 500 shown in FIG. For example, when the deviation amount 501 is −1 (scale), the thickness of the correction spacer 430 for the flange back 90 is determined to be 0.2 mm with reference to the table 500 shown in FIG.

  In the above embodiment, when the relationship between the deviation 501 and the thickness of the correction spacer 430 of the flange back 90 is not linear, the thickness of the correction spacer 430 is referred to with reference to the table 500. However, the present invention is not limited to this form. For example, even if the relationship between the amount of deviation 501 from the marking position of the movable cylinder 415 for focus adjustment with respect to the fixed cylinder 411 and the thickness of the spacer 430 for correction of the flange back 90 is a linear relationship, When the thickness of the correction spacer 430 does not correspond to an integer with respect to one unit of the shift amount 501, for example, when the thickness does not correspond to an integer such as 0.62 mm, 0.08 mm, etc., a table 500 that is a conversion table is displayed. Referring to, the thickness of the correction spacer 430 corresponding to the shift amount 501 may be determined. Thus, by referring to the table 500, the thickness of the correction spacer 430 corresponding to the shift amount 501 can be easily determined.

  Next, in step S120, the spacer 430 for correcting the determined thickness is interposed between the display element unit 420 of the projector 10 to be manufactured and the projection lens unit 410, so that the display element unit of the projector 10 is inserted. 420, the spacer 430, and the projection lens unit 410 are fixed by a fixing member 601 such as a screw.

  In the above-described embodiment, a plurality of spacers 430 having different thicknesses are prepared. For example, a spacer 430 having a predetermined thickness of 0.1 mm or the like is used in an overlapping manner to correct a desired thickness. The spacer 430 may be substituted.

  Further, when it is determined that the thickness of the correction spacer 430 of the flange back 90 is the same as that of the temporary spacer, the temporary spacer may be left attached without replacing the temporary spacer.

  Further, when it is determined that the thickness of the correction spacer 430 of the flange back 90 is 0.0 mm, the projection lens unit 410 is directly connected to the projection lens fixing portion with the temporary spacer removed. The flange back adjustment is performed by attaching to the attachment portion 420b of the frame 420a of a certain display element unit 420.

As described above, in the state where the determined correction spacer 430 is interposed between the display element unit 420 of the projector 10 to be manufactured and the projection lens unit 410, the movable cylinder that is the focus reference position The mark 415m of the 415 and the mark 411m of the fixed cylinder 411 can be positioned so as to be arranged substantially linearly. That is, the flange back 90 distance between the display element 51 and the projection lens unit 410 is provided by interposing the spacer 430 for correcting the determined thickness between the projection lens unit 410 and the display element unit 420. Can be used as a design reference value or can be close to the reference value. In this state, when a test image is projected on a screen that is a predetermined distance away from the projector 10, the focus is adjusted, and the test image projected on the screen has the best image quality. .
Although the inner zoom type projector has been described in the above embodiment, the present invention can be applied to a projector that is not an inner zoom type and that does not have a zoom function.

  As described above, in the embodiment of the present invention, the projection lens unit 410 for the projector 10 has a focus adjustment function, and is a reference mark at the reference position of the focus adjustment movable cylinder 415 that is a focus ring. Since it has both or one of the marks 411m and 415m and the scales 411e and 415e that are the focus scales, the flange back 90 can be easily adjusted without complicated operations when manufacturing the projector. Therefore, it is possible to provide a projector lens unit 410 for a projector that can be manufactured easily and can be manufactured at a low manufacturing cost.

  In the embodiment of the present invention, the marks 411m and 415m are provided at the reference position of the focus adjustment movable cylinder 415 that is a focus ring, and the marks 411m and 415m are located at the center of the movable range of the focus adjustment movable cylinder 415 or the mark 411m and 415m. It is formed near the center. That is, since the marks 411m and 415m are formed at or near the center of the formation range of the scales 411e and 415e that are focus scales, the shift amount 501 with respect to the focus mark position is positive or negative. A projection lens unit 410 that can take values can be provided. In other words, even when the deviation of the focus adjustment range from the reference position is positive or negative, the spacer 430 for correcting the flange back 90 in which the thickness is increased or decreased in increments of 0.1 mm from the specified thickness of 0.3 mm. By using this, it is possible to easily adjust the flange back 90 to the set reference value.

  Further, in the embodiment of the present invention, the scales 411e and 415e which are focus scales are defined in unit length (for example, the flange back 90 of the display element unit 420 of the projector 10 to which the projection lens unit 410 for the projector is attached. , 0.1 mm), the projection lens unit 410 that can easily determine the thickness of the spacer 430 for correcting the flange back 90 can be provided.

  Further, in the embodiment of the present invention, the light source device is formed by the excitation light irradiation device 70, the display element 51, the light source side optical system 170 that guides the light from the light source device to the display element 51, and the display element 51. A projection-side optical system 220 that projects an optical image to be projected onto the screen, and a control unit 38 that is a projector control means for controlling the light source device and the display element 51. The projection-side optical system 170 is used for the projector as described above. Therefore, the projector 10 that can be easily assembled can be provided.

  Further, in the embodiment of the present invention, the projection-side optical system 170 is determined by the shift amount 501 in which the projection lens unit 410 for the projector 10 is determined with reference to the marks 411m and 415m and the focus scales 411e and 415e. A projector 10 capable of easily performing flange back adjustment is provided by using a spacer 430 having a thickness that is fixed to a mounting portion 420b of a frame 420a of a display element unit 420 that is a projection lens fixing portion. Can do.

  Further, in the embodiment of the present invention, the projection lens unit 410 for the projector 10 is fixed by using the projection lens unit 410 including the scales 411e and 415e that are the focus ring scales, and the focus is the projection lens. The unit 410 is fixed by inserting a spacer 430 having a specified thickness, which is a temporary spacer, into the mounting part 420b of the frame 420a of the display element unit 420, which is a lens unit fixing part, and is imaged on a specified screen by the movable cylinder 415, which is a focus ring. Is projected from the scales 411e and 415e, which are the focus ring scales, and according to the focus adjustment amount from the reference value, a predetermined thickness (for example, 0.3 mm) ) Insert spacer 430 for flange back 90 correction that is different in thickness from spacer 430, or Since the projection lens unit 410 is fixed to the mounting portion 420b of the frame 420a of the display element unit 420 which is the lens unit fixing portion without removing the temporary spacer or replacing the temporary spacer, the projection lens unit 410 for the projector 10 is used. It is possible to provide an appropriate fixing method.

  Furthermore, in the embodiment of the present invention, the scales 411e and 415e which are focus scales are the projection lens unit 410 corresponding to the flange back 90 with one scale having a specified unit length (for example, 0.1 mm), and focus adjustment is performed. The projection lens unit 410 is corrected by using a temporary spacer having a specified thickness (for example, 0.3 mm) and a spacer 430 for correcting the flange back 90 having a different thickness by a value obtained by multiplying the number of scales by the specified unit length. Since it is fixed to the mounting part 420b of the frame 420a of the display element unit 420 which is a lens unit fixing part, a correction spacer whose deviation from a temporary spacer having a specified thickness (for example, 0.3 mm) differs from the deviation amount 501. The thickness of 430 can be easily determined.

  In the embodiment of the present invention, a table that is a correlation table between the scales 411e and 415e that are the focus scales of the projection lens unit 410 and the flange back 90 of the projection lens unit 410 is created, and the adjustment is performed by adjusting the focus. The deviation amount 501 of the flange back 90 is read from the table 500 which is a correlation table according to the amount, the temporary spacer having the reference thickness (for example, 0.3 mm) and the spacer 430 having a different thickness are selected, and the projection lens unit 410 is changed to the lens unit Since it is fixed to the mounting part 420b of the frame 420a of the display element unit 420 that is a fixing part, the thickness of the spacer 430 for correcting the flange back 90 can be easily determined using the table 500 that is a correlation table. In addition, it is possible to provide a method of fixing the projection lens unit 410 for a projector that can easily adjust the flange back 90.

  Further, according to the embodiment of the present invention, the scales 411e and 415e formed on the outer periphery of at least one of the fixed cylinder 411 and the movable cylinder 415 of the projection lens unit 410 along the rotation direction of the movable cylinder 415 with respect to the fixed cylinder 411. Therefore, based on the scales 411e and 415e and the marking positions 411m and 415m, the deviation amount 501 can be easily read visually, and the thickness of the correction spacer 430 can be determined from the deviation amount 501. Can be easily determined.

  In addition, according to the embodiment of the present invention, a plurality of groove portions 411c are provided in a predetermined range at predetermined intervals along the rotation direction of the movable cylinder 415 with respect to the fixed cylinder 411 on the outer periphery of at least one of the fixed cylinder 411 or the movable cylinder 415. 415c or projections 411d and 415d to form the scales 411e and 415e, so that the shift amount 501 can be easily visually identified in the grooves 411c and 415c or the projections 411d and 415d. Can do.

  Further, according to the embodiment of the present invention, in the marking in the first step (step S101), the plurality of groove portions 411c and 415c are arranged in a straight line along the optical axis direction in the fixed tube 411 and the movable tube 415. Alternatively, the marks 411m and 415m are formed on any of the protrusions 411d and 415d by, for example, applying paint, applying a sealing material, or notching, so that the fixed cylinder can be seen by visually recognizing the marks 411m and 415m. The reference position of the focus adjustment range of 411 and movable cylinder 415 can be easily specified.

  Further, according to the embodiment of the present invention, the flange back 90 can be easily adjusted by the manufacturing method of the projector 10 without performing complicated work, and from the reference position of the focus adjustment range. Therefore, it is possible to provide the projector 10 that can minimize the deviation and has a low manufacturing cost.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

The invention described in the first claim of the present application will be appended below.
[1] A projection lens unit having a focus adjustment function, having a reference mark at the reference position of the focus ring, and having a focus scale.
[2] The projection lens unit according to claim 1, wherein the reference position of the focus ring is the center of the movable range of the focus ring.
[3] The projection lens unit according to claim 1 or 2, wherein the focus scale corresponds to a deviation of a prescribed unit length of a flange back of the projection lens unit.
[4] a light source device;
A display element;
A light source side optical system for guiding light from the light source device to the display element;
A projection-side optical system that projects an optical image formed by the display element onto a screen;
A projector control means for controlling the light source device and the display element,
The projection lens unit as the projection side optical system is the projection lens unit according to any one of claims 1 to 3.
[5] The projector according to claim 4, wherein in the projection side optical system, the projection lens unit is attached to a lens unit fixing portion using a spacer.
[6] A method of fixing the projection lens unit,
Using a projection lens unit with a focus ring scale, the projection lens unit with the focus as a reference position is fixed by inserting a temporary spacer into the lens unit fixing part,
The image is projected onto the screen by the focus ring and the focus is adjusted.
Read the focus adjustment amount for the optimal image from the focus ring scale,
According to the focus adjustment amount from the reference value, insert a flange back correction spacer having a thickness different from that of the temporary spacer, or remove the temporary spacer or do not replace the temporary spacer. A projection lens unit fixing method, wherein the projection lens unit is fixed to the lens unit fixing portion.
[7] The focus scale is the projection lens unit corresponding to the flange back of one scale specified unit length, and the thickness of the temporary spacer and the thickness is a value obtained by multiplying the number of scales of the focus adjustment amount by the specified unit length. The method for fixing a projection lens unit according to claim 6, wherein the projection lens unit is fixed using correction spacers having different lengths.
[8] A correlation table between the focus scale of the projection lens unit and the flange back of the projection lens unit is created, and the amount of deviation of the flange back is read from the correlation table by the adjustment amount adjusted for focus. 8. The projection lens unit fixing method according to claim 6, wherein a correction spacer having a thickness different from that of the spacer is selected to fix the projection lens unit.

DESCRIPTION OF SYMBOLS 10 Projector 11 Top panel 12 Front panel 13 Rear panel 14 Right side panel 15 Left side panel 17 Exhaust hole 18 Intake hole 19 Lens cover 20 Various terminals 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM
26 display drive unit 31 image compression / decompression unit 32 memory card 35 Ir reception unit 36 Ir processing unit 37 key / indicator unit 38 control unit 41 light source control circuit 43 cooling fan drive control circuit 45 lens motor 47 audio processing unit 48 speaker 51 display Element 60 Light source unit 70 Excitation light irradiation device 71 Excitation light source (light source element)
73 Collimator lens 75 Reflecting mirror group 78 Condensing lens 81 Heat sink 90 Flange back 100 Fluorescent light emitting device 101 Fluorescent wheel 110 Wheel motor 111 Condensing lens group 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 148 Second dichroic mirror 160 Optical system unit 161 Illumination side block 165 Image generation block 168 Projection side block 170 Light source side optical system 173 Condensing lens 175 Light tunnel 178 Condensing lens 181 Optical axis conversion mirror 183 Condensing Lens 185 Irradiation mirror 190 Heat sink 195 Condensing lens 220 Projection side optical system 225 Fixed lens group 235 Movable lens group 241 Control circuit board 261 Cooling Fan 300 Blue light source device 301 Blue light source 305 Condensing lens group 310 Heat sink 410 Projection lens unit (lens unit)
411 Fixed cylinder (fixed part) 411a Tubular main body part 411b Small diameter cylindrical part 411c Groove part 411d Projection part 411e Scale 411m Mark 412 Flange (attachment part)
412a Hole 415 Movable cylinder for focus adjustment (focus ring, movable part)
415a External tooth portion 415b End surface 415c Groove portion 415d Projection portion 415e Scale 415m Mark 420 Display element unit 420a Frame 420b Mounting portion (lens unit fixing portion 430 Spacer 430a Hole 500 Table (conversion table) 501 Deviation amount

Claims (2)

A method of fixing the projection lens unit,
Using a projection lens unit comprising a memory containing a reference position in the focus ring, the flange portion of the front Symbol projection lens unit, and fixed via a flange back correction spacers to the fixing part of the display element unit including a display element,
The image of the display element is projected through the projection lens unit on a screen installed at a predetermined specified distance, and focus adjustment is performed by the focus ring .
Read the focus adjustment amount from the reference position after adjustment from the focus ring scale,
According to the focus adjustment amount, determine the thickness of the flange back correction spacer disposed on the fixed surface of the flange portion of the projection lens unit ,
A method for fixing a projection lens unit , comprising adjusting the flange back correction spacer so as to have a determined thickness . 1 scale of the focus ring, the a the projection lens unit corresponding to the flange back correction defining unit thickness of the thickness of the spacer, the value obtained by multiplying the prescribed unit thickness to scale the number of the focus adjustment amount The projection lens unit fixing method according to claim 1 , wherein a thickness of the flange back correction spacer is adjusted on the basis of the thickness .

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