WO2005093491A1 - 光走査装置およびそれを備えた画像形成装置 - Google Patents
光走査装置およびそれを備えた画像形成装置 Download PDFInfo
- Publication number
- WO2005093491A1 WO2005093491A1 PCT/JP2005/004040 JP2005004040W WO2005093491A1 WO 2005093491 A1 WO2005093491 A1 WO 2005093491A1 JP 2005004040 W JP2005004040 W JP 2005004040W WO 2005093491 A1 WO2005093491 A1 WO 2005093491A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vibration
- resonance frequency
- optical scanning
- scanning device
- torsional vibration
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/1821—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors for rotating or oscillating mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0064—Constitution or structural means for improving or controlling the physical properties of a device
- B81B3/0094—Constitution or structural means for improving or controlling physical properties not provided for in B81B3/0067 - B81B3/0091
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2203/00—Basic microelectromechanical structures
- B81B2203/01—Suspended structures, i.e. structures allowing a movement
- B81B2203/0109—Bridges
Definitions
- the present invention relates to a technique for scanning light by vibrating at least a part of a vibrating body having a reflecting surface that reflects light so as to change a reflecting direction of light incident on the reflecting surface.
- the present invention relates to a technique for optimizing the resonance frequency characteristics of the vibrator by optimizing the shape of the vibrator.
- an optical scanning device that scans light by vibrating at least a part of a vibrating body having a reflecting surface that reflects light to change the direction of reflection of light incident on the reflecting surface.
- a vibrating body having a reflecting mirror section provided with a reflecting surface and a spring section extending from a part of the reflecting mirror and capable of at least torsional vibration is used, and at least one of the vibrating bodies is used.
- An optical scanning device that scans light by vibrating a unit is already known (for example, see Japanese Patent Application Laid-Open No. 2003-84226).
- the present inventors have studied the relationship between the scanning frequency of the optical scanning device described above, the resonance frequency characteristics of the vibrating body, and the shape of the vibrating body, and as a result, obtained the following knowledge. .
- optical scanning is performed by using torsional vibration of the vibrating body, but the vibrating body also includes disturbance vibration, which is other than torsional vibration. Can occur.
- disturbance vibration is when the reflection mirror portion of the vibrating body is This is a phenomenon that vibrates in a direction parallel to the reflection surface, that is, a lateral vibration.
- the vibrating body is normally vibrated at a frequency equal to the resonance frequency of the torsional vibration.
- the vibrating body While applying force, the torsional vibration resonance frequency and the disturbance vibration resonance frequency coincide with each other, or when approaching each other, the vibrating body is moved at a frequency such as the torsional vibration resonance frequency. Even if it vibrates, disturbance vibration is superimposed on torsional vibration in the vibrating body. If the disturbance vibration is superimposed on the torsional vibration, the vibration state of the reflecting surface of the reflection mirror part deviates from the target vibration state with the vibration of the vibrating body, and the characteristics of optical scanning also deviate from the target characteristics. I will.
- the present inventors have conducted research on the resonance frequency characteristics of such a vibrating body, that is, the relationship between the magnitude relationship between the resonance frequencies between different types of vibrations and the shape of the vibrating body. As a result, the present inventors have noticed the following facts.
- the vibrating body used by the present inventors if the vibrating body is designed so that the resonance frequency of the torsional vibration becomes high, the resonance frequency of the disturbance vibration tends to approach the resonance frequency of the torsional vibration. In some cases, they are identical.
- the present invention changes the direction of reflection of light incident on a reflecting surface by vibrating at least a part of a vibrating body having a reflecting surface that reflects light.
- An object of the present invention is to provide a technique for optimizing the resonance frequency characteristics of the vibrating body by optimizing the shape of the vibrating body.
- An optical scanning device that scans light by vibrating at least a part of a vibrating body having a reflection surface that reflects light, thereby changing a reflection direction of light incident on the reflection surface.
- the vibrator The vibrator,
- the resonance frequency of the torsional vibration and the resonance frequency of the disturbance vibration other than the torsional vibration coincide with each other depending on a shape definition parameter that defines a shape in a length direction of the entire spring portion.
- the optical scanning device wherein the shape definition parameter is set in a region where the resonance frequency of the torsional vibration and the frequency of the disturbance vibration do not coincide with each other.
- the present inventors have proposed an optical scanning device that scans light by vibrating at least a part of a vibrating body having a reflection surface that reflects light, thereby changing the reflection direction of light incident on the reflection surface. Researched. At that time, the present inventors paid attention to shape definition parameters that define the shape in the length direction of the entire spring portion.
- the present inventors have determined the relationship between the resonance frequency of the torsional vibration and the resonance frequency of the disturbance vibration other than the torsional vibration, that is, the relationship between the torsional vibration and the disturbance vibration. Note that whether the resonance frequencies are different from each other or different from each other! / The relative relationship with respect to the height of the resonance frequency changes according to the shape definition parameters described above. With. Furthermore, the present inventors have noticed that the vibrating body may have a vibration characteristic in which the resonance frequency of torsional vibration and the resonance frequency of disturbance vibration coincide with each other depending on the setting of the value of the shape definition parameter. Was.
- the present inventors tend to change the magnitude relationship between the resonance frequency of the torsional vibration and the resonance frequency of the disturbance vibration as the shape definition parameter changes (for example, the difference between the resonance frequencies is If they are kept constant, they will decrease and consequently their resonance frequencies will tend to be close to or coincide with each other, and the difference between their resonance frequencies will increase, and consequently their resonance frequencies will tend to be separated from each other.)
- the resonance frequency of the torsional vibration that is, the scanning frequency of the optical scanning device may be high, low in some cases, and more pronounced in some cases.
- the vibrating body has a vibration characteristic in which the resonance frequency of the torsional vibration and the resonance frequency of the disturbance vibration match each other depending on the shape definition parameter. If so, the shape definition parameter is set in a region where the resonance frequency of the torsional vibration and the frequency of the disturbance vibration do not coincide with each other.
- the optical scanning device it becomes easy to design the longitudinal shape of the entire spring portion so as to be suitable for the vibrating body to stably vibrate at a high frequency.
- the vibrating body includes a fixed portion that couples the entire spring portion in a doubly supported manner in cooperation with the reflection mirror portion,
- a first partial spring portion connected to the reflection mirror portion at one end and generating torsional vibration
- a plurality of second partial spring portions that branch and extend and are connected to the fixed portion to generate bending vibration and torsional vibration;
- the optical scanning device comprising: According to this optical scanning device, as a specific example of the entire spring portion suitable for high-speed optical scanning, an entire spring portion having a shape that extends from the reflection mirror portion and then branches to the fixed portion. Is provided.
- each second partial spring portion is divided into a first portion close to the fixing portion and a second portion close to the first portion spring portion, each second partial spring portion The optical scanning device according to (2), wherein the partial spring portion is thinner at the first portion than at the second portion.
- a vibration source that vibrates a vibrating body may be installed on the vibrating body.
- the installation of the vibration source tends to increase the size of the combination of the vibration source and the vibrating body.
- the entire spring portion is locally thinned in the length direction thereof, and a vibration source is installed in the thinned portion. It is possible.
- the vibration source is installed on the whole spring portion in this way, the combination of the vibration source and the whole spring portion installs the vibration source on the whole spring portion without locally thinning the whole spring portion. It is not necessary to increase the size as much as possible.
- the shape definition parameter is set such that a connection position between the first partial spring portion and the plurality of second partial spring portions is out of a longitudinal direction central force of the entire spring portion.
- the first partial spring portion and the plurality of second partial spring portions A vibrating body is provided in such a manner that the connection position with the vibrator deviates from the longitudinal center of the entire spring portion.
- the shape definition parameter is set so that the length dimension of the plurality of second partial spring portions is longer than the length dimension of the first partial spring portion.
- the length dimension of the plurality of second partial spring portions is the first.
- a vibrating body set to be longer than the length dimension of the partial spring portion is provided.
- the disturbance vibration is generated when the reflection mirror section vibrates in a direction parallel to the reflection surface.
- this optical scanning device there is provided a vibrating body in which the resonance frequency of the torsional vibration and the frequency of the lateral vibration do not match each other.
- At least one of the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration changes as the shape definition parameter changes, and at a certain value of the shape definition parameter, the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration are changed.
- the shape definition parameters include a region where the resonance frequency of the torsional vibration is higher than and lower than the resonance frequency of the lateral vibration.
- the shape definition parameter is set in a region where the resonance frequency of the torsional vibration is higher than the resonance frequency of the lateral vibration.
- This setting is advantageous, for example, for improving the easiness of manufacturing the vibrating body and optimizing the shape of the vibrating body in order to easily install a driving source as a vibration source on the vibrating body. there is a possibility.
- the shape defining parameter is set in a range where the resonance frequency of the torsional vibration is different from the resonance frequency of the lateral vibration by about 1 kHz or more.
- the resonance frequency of the torsional vibration is sufficiently separated from the resonance frequency of the lateral vibration. You don't have to be strong.
- the resonance frequency of the torsional vibration is in the range of about 12 kHz to about 40 kHz.
- An oscillator is provided.
- the shape definition parameter is defined as a percentage of the length of the plurality of second partial springs to the length of the entire spring.
- the resonance frequency of the torsional vibration and the frequency of the disturbance vibration do not coincide with each other.
- a vibrating body is provided wherein the shape defining parameter, defined as a percentage of the length dimension of the partial spring, is set in a range from about 65 percent to about 85 percent.
- the reflection mirror portion and the entire spring portion are both formed in a plate shape and are arranged on the same plane.
- An optical scanning device according to claim 1.
- the reflecting mirror portion has a disk shape, and when at least one of both surfaces thereof is a reflecting surface, it has the same lateral dimension as the reflecting mirror portion and has a rectangular shape. In addition, it is easy to reduce the moment of inertia of a part of the reflection mirror, and it is also easy to raise the resonance frequency.
- the resonance frequency can be easily increased even by optimizing the reflection mirror section.
- the reflection mirror section is caused to swing around an oscillation axis by the torsional vibration, and the entire spring section is provided on the vibrating body with the oscillation axis being separated by the reflection mirror section.
- the optical scanning device according to any one of (1) to (12), which is disposed at two opposing positions facing each other in the direction.
- An image forming apparatus that forms an image by scanning a light beam
- the scanning unit that scans a light beam emitted from the light source by using the optical scanning device according to any one of (14) to (11), and using the optical scanning device.
- An image forming apparatus including:
- the optical scanning device according to any one of the above (1) to (14) Utilizing the method makes it easy to increase the scanning frequency and improve the resolution of an image.
- this image forming apparatus in a so-called retinal scanning display, by using the optical scanning device according to any one of the above items (1) to (14), the scanning frequency is increased and the image is reproduced. It is easy to improve the resolution.
- FIG. 1 is a system diagram showing a retinal scanning display including an optical scanning device according to a first embodiment of the present invention.
- FIG. 2 is an exploded perspective view showing the optical scanning device 104 in FIG. 1.
- FIG. 3 is a cross-sectional view and a perspective view showing a driving source 154 in FIG. 2 together with a peripheral portion thereof.
- FIG. 4 is a perspective view showing a vibrating body 124 in FIG. 2.
- FIG. 5 is a block diagram showing an internal configuration of a horizontal scanning drive circuit 180 in FIG. 1 and connections with external elements.
- FIG. 6 is a perspective view showing a vibrating body 124 in FIG. 2.
- FIG. 7 is a cross-sectional view showing each part of the vibrating body 124 shown in FIG. 6.
- FIG. 8 is a graph showing a relationship between a resonance frequency and a length ratio of vibrating body 124 shown in FIG. 6.
- FIG. 9 is a perspective view for explaining the longitudinal vibration in FIG.
- FIG. 10 is a perspective view for explaining the lateral vibration in FIG. 1 in FIG.
- FIG. 11 is a perspective view for explaining torsional vibration in FIG.
- FIG. 12 is a perspective view for explaining twice the longitudinal vibration in FIG. 8.
- FIG. 13 is a perspective view and a graph for explaining vibration of vibrating body 124 in state A in FIG. 8.
- FIG. 14 is a perspective view and a graph for explaining the vibration of vibrating body 124 in state B in FIG. 8.
- FIG. 15 is a graph showing a relationship between a resonance frequency and a length ratio of a comparative example in which a reflecting mirror portion is a vibrating body having a rectangular thin plate shape.
- FIG. 16 is a graph showing a relationship between a resonance frequency of vibrating body 124 and a length ratio in optical scanning device 104 according to the second embodiment of the present invention.
- FIG. 17 is a graph showing the relationship between the resonance frequency of vibrating body 124 and the length ratio in optical scanning device 104 according to the third embodiment of the present invention.
- FIG. 18 is a graph showing the relationship between the resonance frequency of vibrator 124 and the length ratio in optical scanning device 104 according to the fourth embodiment of the present invention.
- FIG. 1 systematically shows a retinal scanning display device including the optical scanning device according to the first embodiment of the present invention.
- This retinal scanning display device (hereinafter abbreviated as “RSD”) converts a laser beam as light through a pupil 12 of an observer's eye 10 while appropriately modulating its wavefront and intensity.
- This is a device for projecting an image directly on the retina 14 by causing the laser beam to two-dimensionally scan on the image forming plane.
- the RSD includes a light source unit 20 and a scanning device 24 between the light source unit 20 and the observer's eye 10.
- the light source unit 20 includes an R laser 30 that emits a red laser beam in order to generate a laser beam of an arbitrary color by combining three laser beams having three primary colors (RGB) into one laser beam.
- Each of the lasers 30, 32, and 34 can be configured as, for example, a semiconductor laser.
- the laser beams emitted from the lasers 30, 32, and 34 are collimated by the collimating optical systems 40, 42, and 44, respectively, in order to combine them.
- the laser beam is made incident on the Kroitsk mirrors 50, 52, and 54, whereby each laser beam is selectively reflected and transmitted with respect to wavelength.
- the red laser beam emitted from the R laser 30 is collimated by the collimating optical system 40 and then is incident on the dichroic mirror 50.
- the green laser beam emitted from the G laser 32 is made incident on a dichroic mirror 52 via a collimating optical system 42.
- the blue laser beam emitted from the B laser 34 is made incident on a dichroic mirror 54 via a collimating optical system 44.
- the light source unit 20 includes a signal processing circuit 60 mainly composed of a computer.
- the signal processing circuit 60 is designed to perform signal processing for driving each of the lasers 30, 32, and 34 and signal processing for scanning a laser beam based on a video signal to which an external force is also supplied. ing.
- the signal processing circuit 60 In order to drive each of the lasers 30, 32, and 34, the signal processing circuit 60 generates a laser beam for each pixel on the image to be projected on the retina 14 based on an image signal supplied from the outside. Then, a drive signal necessary for realizing a required color and intensity is supplied to each of the lasers 30, 32, and 34 via each of the laser drivers 70, 72, and 74. Signal processing for scanning the laser beam will be described later.
- the light source unit 20 described above condenses a laser beam in the coupling optical system 56 and makes it incident on the optical fiber 82.
- the laser beam incident on the optical fiber 82 is transmitted through the optical fiber 82 as an optical transmission medium, and the rear end force of the optical fiber 82 passes through a collimating optical system 84 that collimates the emitted laser beam to produce a wavefront.
- the light enters the modulation optical system 22.
- the wavefront modulation optical system 22 is an optical system that modulates the wavefront (wavefront curvature) of the laser beam emitted from the light source unit 20.
- the wavefront modulation optical system 22 can be configured to modulate the wavefront curvature for each pixel of the image to be projected on the retina 14, which is indispensable for implementing the present invention. In this case, it is possible to use a format that is performed for each frame of the image. Modulating the wavefront curvature changes the perspective of the displayed image And changing the focus position of the displayed image.
- the wavefront modulation optical system 22 modulates the wavefront of the laser beam incident on the wavefront modulation optical system 22 based on the depth signal input from the signal processing circuit 60.
- a laser beam incident as collimated light from the collimating optical system 84 is converted into convergent light by a converging lens 90, and the converted converged light is reflected by a movable mirror 92 to be diffused light. Is converted to The converted diffused light passes through the converging lens 90 and exits from the wavefront modulation optical system 22 as a laser beam having a target wavefront curvature.
- the wavefront modulation optical system 22 includes a beam splitter 94 that reflects or transmits a laser beam that has entered from the outside, and a convergence that converges the laser beam that has entered through the beam splitter 94. It has a lens 90 and a movable mirror 92 that reflects the laser beam converged by the converging lens 90.
- the wavefront modulation optical system 22 further includes an actuator 96 that displaces the movable mirror 92 toward or away from the converging lens 90.
- the actuator 96 is a piezoelectric element.
- Actuator 96 modulates the wavefront curvature of the laser beam emitted from wavefront modulating optical system 22 by moving the position of movable mirror 92 in accordance with the depth signal input from signal processing circuit 60.
- the laser beam input from the collimating optical system 84 is reflected by the beam splitter 94 and passes through the converging lens 90, and then reflected by the movable mirror 92. I do. Then, the light passes through the converging lens 90 again, and thereafter, passes through the beam splitter 94 and travels to the scanning device 24.
- the scanning device 24 includes a horizontal scanning system 100 and a vertical scanning system 102.
- the horizontal scanning system 100 is an optical system that performs horizontal scanning in which a laser beam is horizontally raster-scanned along a plurality of horizontal scanning lines for each frame of an image to be displayed.
- the vertical scanning system 102 is an optical system that performs vertical scanning in which a laser beam is vertically scanned from a first scanning line to a last scanning line for each frame of an image to be displayed.
- the horizontal scanning system 100 is designed to scan the laser beam faster than the vertical scanning system 102, that is, at a higher frequency.
- the horizontal scanning system 100 includes an optical scanning device 104 that oscillates a mirror by vibrating an elastic body having a mirror that performs mechanical deflection. .
- the optical scanning device 104 is controlled based on a horizontal synchronization signal supplied from the signal processing circuit 60.
- FIG. 2 shows the optical scanning device 104 in an exploded perspective view.
- the optical scanning device 104 includes a main body 110 mounted on a base 112.
- the main body 110 is formed using an elastic material such as silicon. As shown in the upper part of FIG. 2, the main body 110 has a thin rectangular shape having a through hole 114 through which light can pass.
- the main body 110 has a fixed frame 116 on the outside, and a vibrating body 124 having a reflection mirror 122 on which a reflection surface 120 is formed on the inside.
- the base 112 includes, as shown in the lower part of FIG. It is configured to have a vibrating body 124 and a concave portion 132 opposed thereto.
- the concave portion 132 is formed to have a shape that does not interfere with the base 112 even when the vibrating body 124 is displaced by vibration when the main body 110 is mounted on the base 112.
- the reflection surface 120 of the reflection mirror unit 122 is swung about a swing axis 134 which is also a center line of symmetry thereof.
- the vibrating body 124 further includes a whole spring portion 140 extending from the reflection mirror portion 122 on the same plane as the reflection mirror portion 122 and joining the reflection mirror portion 122 to the fixed frame 116.
- a pair of overall spring portions 140 extend from opposite sides of the reflection mirror portion 122 in opposite directions. Both the reflection mirror section 122 and the pair of overall spring sections 140, 140 have a plate shape and are arranged on the same plane.
- Each overall spring portion 140 includes one mirror-side leaf spring portion 142, a pair of frame-side leaf spring portions 144, and a connection portion that connects the mirror-side leaf spring portion 142 and the pair of frame-side leaf spring portions 144 to each other. 146 are included.
- the mirror-side leaf spring portion 142 is formed on the oscillation axis 134 on the oscillation axis 134 from each of a pair of edges facing each other in the direction of the oscillation axis 134 of the reflection mirror portion 122 to the corresponding connection portion 146. Extends along.
- the pair of frame-side leaf spring portions 144, 144 from the corresponding connection portion 146 to the swing axis 134. And extends along the swing axis 134 in a posture that is offset in the opposite direction.
- drive sources 150, 152, 154, and 156 are attached to the pair of frame-side leaf spring portions 144, 144 and fixed to the fixed frame 116, respectively. It is mounted in an extended posture.
- each frame-side leaf spring portion 144 is locally thin-plated on the side close to the fixed frame 116, thereby forming a concave portion 158.
- a recess 159 that is continuous with the recess 158 is formed in the fixed frame 116.
- Each of the driving sources 150, 152, 154, and 156 has a driving source 154 force as shown in Fig. 3. ⁇ )).
- the piezoelectric body 160 has a thin plate shape and is attached to one surface of the vibrating body 124.
- the piezoelectric body 160 is sandwiched between the upper electrode 162 and the lower electrode 164 in a direction perpendicular to the attachment surface.
- the upper electrode 162 and the lower electrode 164 are connected to a pair of input terminals 168 provided on the fixed frame 116 by respective lead wires (not shown).
- the present invention can be carried out in such a manner that the upper electrode 162 and the lower electrode 164 are connected to external terminals, not shown, by respective lead wires (not shown).
- the drive sources 150, 152, 154, and 156 respectively attached to the four frame-side leaf springs 144 are located on one side with respect to the swing axis 134.
- a pair of drive sources 150 and 152 sandwiching a part of the reflection mirror 122 and a pair of drive sources 154 and 156 located on the other side and sandwiching the reflection mirror unit 122 are respectively two piezoelectric bodies 160 belonging to each pair. Are bent so that their free ends are displaced in the same direction as each other.
- a pair of drive sources 150 and 154 located on one side of the reflection mirror unit 122 and sandwiching the oscillation axis 134, and a pair of drive sources 15 2 located on the other side and sandwiching the oscillation axis 134 And 156 are bent so that the free ends of the two piezoelectric bodies 160 belonging to each pair are displaced in opposite directions.
- a displacement for rotating the reflection mirror unit 122 in the same direction is applied to the reflection mirror unit 122 by a pair of driving sources 150 and 150 located on one side with respect to the oscillation axis 134. It is generated by both the displacement in one direction of 152 and the displacement in the opposite direction of the pair of driving sources 154 and 156 located on the opposite side.
- each frame-side leaf spring portion 144 has a function of converting a linear displacement (lateral displacement) of the piezoelectric body 160 attached thereto into a bending motion (longitudinal displacement). This has the function of converting the bending motion of the frame-side leaf spring portion 144 into the rotation motion of the mirror-side leaf spring portion 142.
- the reflecting mirror section 122 is rotated by the rotational movement of the mirror side leaf spring section 142.
- the two driving sources 150 and 152 forming the first pair and the two driving sources 154 and 156 forming the second pair are displaced in directions opposite to each other, and the reflection mirror section is formed.
- An alternating voltage is applied to the two driving sources 150 and 152 forming the first pair in the same phase in order to generate a reciprocating rotational movement or oscillating movement of the driving source 122 around its driving axis 134.
- the alternating voltage force having the opposite phase is applied to the two driving sources 154 and 156 forming the second pair in the same phase.
- the horizontal scanning system 100 includes a horizontal scanning drive circuit 180 shown in FIG.
- the generator 182 generates an alternating voltage signal based on the horizontal synchronization signal input from the signal processing circuit 60.
- the oscillator 182 is connected to a first pair of two driving sources 150 and 152 via a first path via a phase shifter 184 and an amplifier 186, while passing through a phase inverting circuit 188, a phase shifter 190 and an amplifier 192. Via a second path, it is connected to a second pair of two driving sources 154, 156.
- the phase inversion circuit 188 inverts the phase of the alternating voltage signal input from the oscillator 182 and supplies it to the phase shifter 190. Since this phase inverting circuit 188 is provided only in the second path, two driving sources 150 and 152 forming the first pair and two driving sources 154 and 156 forming the second pair have corresponding amplifiers. The phases of the alternating voltage signals supplied from 186 and 192 are opposite to each other.
- phase shifters 184 and 190 provide an alternating voltage to be supplied to the driving sources 150, 152, 154 and 156 so that the video signal and the vibration of the reflection mirror unit 122 are synchronized with each other. It is provided to change the phase of the signal.
- the same vibrating body 124 is provided with four driving sources 150, 152, 154, 156. Forces of all of them are operated together. It is not indispensable to perform optical scanning by the resonance of 124.
- One of the four driving sources 150, 152, 154, 156 even if it is not actuated, if the vibration matching the resonance frequency of the vibrating body 124 is performed, the optical scanning This is because the mode is excited, which causes the vibrating body 124 to generate rotational vibration about the oscillation axis.
- the laser beam horizontally scanned by the optical scanning device 104 described above is transmitted to the vertical scanning system 102 by the relay optical system 194, as shown in FIG.
- This RSD has a beam detector 200 at a fixed position.
- the beam detector 200 is provided to detect the position of the laser beam in the horizontal scanning direction by detecting the laser beam deflected by the optical scanning device 104.
- One example of the beam detector 200 is a photodiode.
- the beam detector 200 outputs a signal indicating that the laser beam has reached a predetermined position as a BD signal, and the output BD signal is supplied to the signal processing circuit 60.
- the signal processing circuit 60 After waiting for a set time to elapse from the time when the detector 200 detects the laser beam, a necessary drive signal is supplied to each of the laser drivers 70, 72, and 74.
- the image display start timing is determined for each scanning line, and the image display is started at the determined image display start timing.
- the vertical scanning system 102 includes the galvano mirror 210 as an oscillating mirror for performing mechanical deflection.
- the laser beam emitted from the horizontal scanning system 100 is condensed by the relay optical system 194 and enters the galvanometer mirror 210.
- the galvanomirror 210 is swung around a rotation axis that intersects the optical axis of the laser beam incident on the galvanomirror.
- the starting timing and the rotation speed of the galvanometer mirror 210 are controlled based on a vertical synchronization signal supplied from the signal processing circuit 60.
- the laser beam is two-dimensionally scanned by the horizontal scanning system 100 and the vertical scanning system 102 described above, and the image is expressed by the scanned laser beam.
- the eye 10 is irradiated.
- FIG. 6 is a perspective view showing details of the shape of vibrating body 124.
- the vibrating body 124 has a pair of overall spring portions 140, 140 in a posture sandwiching the reflecting mirror portion 122.
- the shape of the pair of overall spring portions 140, 140 Only the spring 140 will be described representatively.
- the length of the entire spring portion 140 and the length of the recess 158 are determined by the relationship between the length of the fixed frame 116 and the length of the drive sources 150, 152, 154, and 156. Since each length is determined, it is fixed. Specifically, the length of the entire spring portion 140 is set to 2 mm, and the length of the recess 158 is set to 1 mm.
- the length of the mirror-side leaf spring portion 142 and the length of the frame-side leaf spring portion 144 are both variable values, provided that their total is 2 mm.
- the length dimension of the mirror-side leaf spring portion 142 and the length dimension of the frame-side leaf spring portion 144 are represented by a length dimension a and a length dimension b, respectively.
- FIG. 7 shows a cross-sectional shape of each part of the whole spring portion 140.
- the basic cross-sectional shape of the entire spring portion 140 is a hexagon whose opposite sides are parallel to each other.
- FIG. 7A is a cross-sectional view taken along the line AA in FIG. 6, and shows a cross-sectional shape of the mirror-side leaf spring portion 142.
- FIG. 7B is a cross-sectional view taken along a line BB in FIG. 6, and shows a cross-sectional shape of a portion of the frame-side leaf spring portion 142 where the concave portion 158 is not formed.
- FIG. 7C is a cross-sectional view taken along the line CC in FIG. 6, and shows a cross-sectional shape of a portion of the frame-side leaf spring portion 142 where the concave portion 158 is formed.
- the diameter of the reflection mirror section 122 is set to 1 mm, and the thickness force is set to OO m!
- the present inventors have analyzed the vibration of the vibrating body 124 having the dimensions and shapes described above by simulation using a computer. The analysis was repeated while changing the value of the length ratio ⁇ . As a result, as shown in the graph of FIG. 8, a plurality of vibration modes of the vibrating body 124 occurred, and it was found that the resonance frequency of torsional vibration necessary for optical scanning by the optical scanning device 104 was about 30 kHz. did.
- vibrations other than torsional vibration are disturbance vibrations, and among the disturbance vibrations, those having a resonance frequency close to the resonance frequency of torsional vibration are shown in FIG.
- longitudinal vibration order 1
- lateral vibration order 1
- double longitudinal vibration order 2
- the longitudinal vibration is a phenomenon in which the reflection mirror section 122 makes a linear reciprocating motion in the normal direction of the reflection surface 120, as shown in FIG.
- This longitudinal vibration is a primary vibration with one antinode and two nodes.
- Lateral vibration is a phenomenon in which the reflection mirror section 122 linearly reciprocates in the tangential direction of the reflection surface 120 as shown in FIG.
- the torsional vibration is a phenomenon in which the reflection mirror unit 122 swings around the swing axis 134 as shown in FIG.
- the double longitudinal vibration is a secondary vibration with two antinodes and three nodes, as shown in Fig. 12.
- the resonance frequency of the torsional vibration was maintained substantially constant regardless of the change in the length ratio ⁇ .
- the resonance frequency of the transverse vibration decreases as the length ratio ⁇ decreases.
- the length ratio ⁇ was about 70%, it coincided with the resonance frequency of torsional vibration. That is, in the present embodiment, the length ratio ⁇ when the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration match each other is about 70%.
- FIG. 8 shows that the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration are sufficiently separated from each other, and that the state is a state ⁇ , and the state of being coincident with the resonance frequency is a state ⁇ .
- FIG. 13 shows a perspective view and a graph of the vibration of vibrating body 124 in state ⁇ .
- the vibrating body 124 when the vibrating body 124 is vibrated at a frequency equal to the resonance frequency of the torsional vibration, only the torsional vibration occurs in the vibrating body 124 and the resonance frequency of the torsional vibration is reduced so that the lateral vibration is not generated.
- the resonance frequency of the lateral vibration are set. Desirably, the difference is about lkHz or more.
- the length ratio ⁇ increases from about 70%, the difference between the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration increases, and Similarly, as the length ratio ⁇ decreases from about 70%, the difference between the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration also increases.
- Length ratio ⁇ force For example, a value of about 75% or more or a value of about 65% or less, preferably a value of about 80% or more or a value of about 60% or less, more preferably a value of about 85% or more More preferably, it is set to a value of about 90% or more.
- the mirror The connecting position (that is, the position of the connecting portion 146) between the side leaf spring portion 142 and the frame-side leaf spring portion 144 is positioned so that the central force in the length direction of the entire spring portion 140 is also released.
- the length ratio ⁇ is set to a value higher than 50%, the length of the frame-side leaf spring portion 144 becomes longer than the length of the one-side leaf spring portion 142 It is set as follows.
- the resonance frequency of the torsional vibration is set to a value higher than the resonance frequency of the lateral vibration.
- FIG. 14 shows a perspective view and a graph of the vibration of vibrating body 124 in state # 2 of FIG. In this state ⁇ , as shown in the graph, when the vibrating body 124 is vibrated at a frequency equal to the resonance frequency of the torsional vibration, torsional vibration occurs at the vibrating body 124 at the maximum frequency at the vibration frequency, and at the same time, Lateral vibration is also generated a little strongly
- the length shape of the entire spring portion 140 is optimized by optimizing the length ratio ⁇ , whereby only torsional vibration is induced in the vibrating body 124.
- the vibration of the vibrating body 124 for optical scanning is performed as desired.
- the reflection mirror section 122 has a circular thin plate shape.
- FIG. 15 is a graph showing the resonance frequency characteristics of the comparative example in which the reflection mirror section has a rectangular thin plate shape.
- the maximum lateral dimension of the reflecting mirror section is set equal to the maximum lateral dimension of the reflecting mirror section 122 in the present embodiment.
- the resonance frequency of the torsional vibration is maintained at about 22.5 kHz regardless of the length ratio ⁇ . This value is lower than about 30 kHz, which is the resonance frequency of the torsional vibration in the present embodiment.
- the moment of inertia of the reflecting mirror in the comparative example is higher than that of the reflecting mirror 122 in the present embodiment.
- the reason is that the resonance frequency of the comparative example is lower than that of the present embodiment because it is larger than the moment.
- the reflection mirror section 122 has a circular thin plate shape, the scanning frequency of the optical scanning device 104 is increased, and the resolution of the displayed image is increased. It is easier than in the case of a rectangular thin plate.
- the optical scanning by the optical scanning device 104 is suppressed from being affected by vibrations other than torsional vibration at a relatively high frequency. While it is easy to do.
- the length ratio ⁇ forms an example of the “shape definition parameter” in the above item (1)
- the lateral vibration is the “disturbance vibration” in the same item. It is an example of this.
- the mirror-side leaf spring 142 constitutes an example of the “first partial spring portion” in the above item (2), and the two frame-side leaf spring portions 144 constitute the “plurality” in the same item.
- the fixed frame 116 forms an example of the “fixed portion” in the same section.
- each frame-side leaf spring portion 144 when each frame-side leaf spring portion 144 is divided into a first portion near the fixed frame 116 and a second portion near the mirror-side leaf spring portion 142, each frame-side leaf spring portion By forming the concave portion 158 in the first portion of the portion 144, the first portion is thinner than the second portion. That is, in the present embodiment, the formation of the concave portion 158 constitutes an example of “thinning” in the above item (3).
- the present embodiment differs from the first embodiment only in the width dimension of each part of the whole spring portion 140, and the other elements are common. Elements are referenced using the same reference numerals or names, and detailed description is omitted.
- the effective width of the mirror-side leaf spring 142 is 75 ⁇ m, and the effective width of the frame-side leaf spring 144 is 55 ⁇ m.
- both the effective width of the mirror-side leaf spring portion 142 and the effective width of the frame-side leaf spring portion 144 are set longer than in the first embodiment.
- the presence of the mirror-side leaf spring 142 The effective width is set to 100 / zm, and the effective width of the frame-side leaf spring 144 is set to 80 m.
- both the width of the mirror-side leaf spring portion 142 and the width of the frame-side leaf spring portion 144 are made wider than in the first embodiment, whereby the torsional rigidity of the mirror-side leaf spring portion 142 and the bending rigidity of the frame-side leaf spring portion 144 are increased. It is increased from the form.
- FIG. 16 is a graph showing the resonance frequency characteristics of the vibrating body 124 in the present embodiment.
- the resonance frequency of the torsional vibration is about 40 kHz, which is higher than in the first embodiment.
- the resonance frequency of the transverse vibration increases with the decrease of the length ratio ⁇ , and coincides with the resonance frequency of the torsional vibration when the length ratio ⁇ is about 82%. That is, in the present embodiment, the length ratio ⁇ when the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration match each other is about 82%.
- the length ratio ⁇ force is, for example, a value of about 80% or less, or a value of about 85% or more, preferably a value of about 75% or less, or a value of about 90% or more.
- the value is more preferably set to a value of about 70% or less or about 95% or more.
- the optical scanning by the optical scanning device 104 is suppressed from being affected by vibrations other than torsional vibration at a relatively high frequency. While it is easy to do.
- this embodiment is different from the first embodiment only in the width dimension of each part of the entire spring portion 140, and the other elements are common. Elements are referenced using the same reference numerals or names, and detailed description is omitted.
- the effective width of the mirror-side leaf spring 142 is 75 ⁇ m, and the effective width of the frame-side leaf spring 144 is 55 ⁇ m.
- both the effective width of the mirror-side leaf spring portion 142 and the effective width of the frame-side leaf spring portion 144 are set shorter than in the first embodiment.
- the presence of the mirror-side leaf spring 142 The effective width is set to m, and the effective width of the frame-side leaf spring portion 144 is set to 1 ⁇ m.
- both the width of the mirror-side leaf spring portion 142 and the width of the frame-side leaf spring portion 144 are smaller than in the first embodiment, whereby the torsional rigidity of the mirror-side leaf spring portion 142 and the bending rigidity of the frame-side leaf spring portion 144 are reduced. It is reduced from the embodiment.
- FIG. 17 is a graph showing the resonance frequency characteristics of the vibrating body 124 in the present embodiment.
- the resonance frequency of the torsional vibration is about 20 kHz, which is lower than that of the first embodiment.
- the resonance frequency of the transverse vibration increases with the decrease of the length ratio ⁇ , and coincides with the resonance frequency of the torsional vibration when the length ratio ⁇ is about 65%. That is, in the present embodiment, the length ratio ⁇ when the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration match each other is about 65%.
- the length ratio ⁇ force is, for example, a value of about 60% or less, or a value of about 70% or more, desirably, a value of about 75% or more, more desirably, It is set to a value of about 80% or more.
- the present embodiment differs from the third embodiment only in the thickness dimension of the entire spring portion 140, and since other elements are common, only different elements will be described in detail, and common elements will be described. Are referred to using the same reference numerals or names, and a detailed description thereof will be omitted.
- the thickness dimension of the entire spring portion 140 (excluding the concave portion 158) is 100 m. It is set shorter than the form. Specifically, the thickness dimension of the entire spring portion 140 is set to 40 m. That is, the thickness of the entire spring portion 140 is made smaller than that of the third embodiment, whereby the torsional rigidity of the mirror-side leaf spring portion 142 and the bending rigidity of the frame-side leaf spring portion 144 are reduced as compared with the third embodiment. It is.
- FIG. 18 is a graph showing the resonance frequency characteristic of the vibrating body 124 in the present embodiment. ing.
- the resonance frequency of the torsional vibration is about 12 kHz, which is lower than that of the third embodiment.
- the resonance frequency of the transverse vibration increases with the decrease of the length ratio ⁇ , and coincides with the resonance frequency of the torsional vibration when the length ratio ⁇ is about 85%. That is, in the present embodiment, the length ratio ⁇ when the resonance frequency of the torsional vibration and the resonance frequency of the lateral vibration match each other is about 85%.
- the length ratio ⁇ force is, for example, a value of about 80% or less, or a value of about 90% or more, desirably, a value of about 75% or less, or a value of about 95% or more. It is set to a value, and more preferably, to a value of about 70% or less.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Micromachines (AREA)
- Facsimile Scanning Arrangements (AREA)
- Laser Beam Printer (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/526,734 US7639413B2 (en) | 2004-03-26 | 2006-09-26 | Resonant optical scanner using vibrating body with optimized resonant frequency characteristics and image forming apparatus having the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-090890 | 2004-03-26 | ||
JP2004090890A JP4461870B2 (ja) | 2004-03-26 | 2004-03-26 | 光走査装置およびそれを備えた画像形成装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/526,734 Continuation US7639413B2 (en) | 2004-03-26 | 2006-09-26 | Resonant optical scanner using vibrating body with optimized resonant frequency characteristics and image forming apparatus having the same |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005093491A1 true WO2005093491A1 (ja) | 2005-10-06 |
Family
ID=35056332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/004040 WO2005093491A1 (ja) | 2004-03-26 | 2005-03-09 | 光走査装置およびそれを備えた画像形成装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US7639413B2 (ja) |
JP (1) | JP4461870B2 (ja) |
WO (1) | WO2005093491A1 (ja) |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4857582B2 (ja) * | 2005-03-30 | 2012-01-18 | ブラザー工業株式会社 | 光走査装置および光走査装置の制御方法 |
JP4655977B2 (ja) * | 2006-03-22 | 2011-03-23 | ブラザー工業株式会社 | 光スキャナ、及び、光走査装置、及び、画像表示装置、及び、網膜走査型画像表示装置、及び、光スキャナにおける梁部の形成方法 |
CN101426717B (zh) * | 2006-04-24 | 2012-12-05 | 弗兰霍菲尔运输应用研究公司 | 用于悬挂可偏转的微型机械元件的扭力弹簧元件 |
JP2008065191A (ja) * | 2006-09-08 | 2008-03-21 | Seiko Epson Corp | アクチュエータ、光スキャナおよび画像形成装置 |
JP4720701B2 (ja) * | 2006-09-21 | 2011-07-13 | セイコーエプソン株式会社 | アクチュエータ、アクチュエータの製造方法、光スキャナおよび画像形成装置 |
JP4840058B2 (ja) | 2006-09-29 | 2011-12-21 | ブラザー工業株式会社 | 光走査装置及びそれを備えた画像表示装置並びに網膜走査型画像表示装置、及び光走査素子の駆動方法 |
US7864390B2 (en) * | 2007-05-28 | 2011-01-04 | Konica Minolta Opto, Inc. | Image display apparatus |
US8717652B2 (en) * | 2008-01-10 | 2014-05-06 | Konica Minolta Opto, Inc. | Micro scanner device and method for controlling micro scanner device |
JP5239379B2 (ja) * | 2008-02-18 | 2013-07-17 | パナソニック株式会社 | 光学反射素子 |
JP5239382B2 (ja) * | 2008-02-19 | 2013-07-17 | パナソニック株式会社 | 光学反射素子 |
US8422109B2 (en) | 2008-01-31 | 2013-04-16 | Panasonic Corporation | Optical reflection element |
JP5077139B2 (ja) * | 2008-08-18 | 2012-11-21 | パナソニック株式会社 | 光学反射素子 |
JP2011107675A (ja) * | 2009-10-20 | 2011-06-02 | Seiko Epson Corp | 光偏向素子、光偏向器、及び画像形成装置 |
US8771085B1 (en) | 2010-08-06 | 2014-07-08 | Arthur C. Clyde | Modular law enforcement baton |
US8337103B2 (en) * | 2010-11-15 | 2012-12-25 | DigitalOptics Corporation MEMS | Long hinge actuator snubbing |
US8604663B2 (en) | 2010-11-15 | 2013-12-10 | DigitalOptics Corporation MEMS | Motion controlled actuator |
US8608393B2 (en) * | 2010-11-15 | 2013-12-17 | DigitalOptics Corporation MEMS | Capillary actuator deployment |
WO2013046612A1 (ja) * | 2011-09-30 | 2013-04-04 | パナソニック株式会社 | 光学反射素子 |
CN104834161A (zh) * | 2014-02-07 | 2015-08-12 | 光宝科技股份有限公司 | 投影装置及其控制方法 |
CN108604008B (zh) * | 2016-02-17 | 2020-11-10 | 三菱电机株式会社 | 反射镜驱动装置、反射镜驱动装置的控制方法及反射镜驱动装置的制造方法 |
DE102016014001B4 (de) * | 2016-11-23 | 2020-11-12 | Blickfeld GmbH | MEMS Scanmodul für einen Lichtscanner mit mindestens zwei Stützelementen |
JP7112876B2 (ja) | 2017-07-06 | 2022-08-04 | 浜松ホトニクス株式会社 | 光学デバイス |
US11187872B2 (en) | 2017-07-06 | 2021-11-30 | Hamamatsu Photonics K.K. | Optical device |
WO2019009392A1 (ja) * | 2017-07-06 | 2019-01-10 | 浜松ホトニクス株式会社 | 光学デバイス |
US11635613B2 (en) | 2017-07-06 | 2023-04-25 | Hamamatsu Photonics K.K. | Optical device |
EP3650911B1 (en) | 2017-07-06 | 2023-08-30 | Hamamatsu Photonics K.K. | Optical device |
DE102017118776B4 (de) * | 2017-08-17 | 2020-11-12 | Blickfeld GmbH | Scaneinheit mit mindestens zwei Stützelementen und einem freistehenden Umlenkelement und Verfahren zum Scannen von Licht |
DE102017219929B4 (de) * | 2017-11-09 | 2019-05-23 | Robert Bosch Gmbh | Mikromechanischer z-Inertialsensor |
EP4160295A1 (en) | 2017-11-15 | 2023-04-05 | Hamamatsu Photonics K.K. | Optical device production method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002174794A (ja) * | 2000-12-07 | 2002-06-21 | Denso Corp | 光スキャナ |
JP2002250890A (ja) * | 2001-02-22 | 2002-09-06 | Canon Inc | マイクロ構造体、マイクロ光偏向器、光走査型表示装置、及びそれらの製造方法 |
JP2003057586A (ja) * | 2001-08-20 | 2003-02-26 | Brother Ind Ltd | 光走査装置、光走査装置に用いられる振動体及び光走査装置を備えた画像形成装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5629790A (en) * | 1993-10-18 | 1997-05-13 | Neukermans; Armand P. | Micromachined torsional scanner |
US5488862A (en) * | 1993-10-18 | 1996-02-06 | Armand P. Neukermans | Monolithic silicon rate-gyro with integrated sensors |
JP2001519726A (ja) * | 1997-04-01 | 2001-10-23 | クセロス・インク | 微細加工捩り振動子の動的特性の調整 |
US6486995B2 (en) * | 2000-04-28 | 2002-11-26 | Denso Corporation | Vibration-resisting structure of optical scanner |
US7068296B2 (en) * | 2001-09-14 | 2006-06-27 | Ricoh Company, Ltd. | Optical scanning device for reducing a dot position displacement at a joint of scanning lines |
JP4390174B2 (ja) | 2001-09-14 | 2009-12-24 | 株式会社リコー | 光走査装置 |
JP3733383B2 (ja) | 2002-01-15 | 2006-01-11 | 日産自動車株式会社 | 2次元光スキャナ |
US7446911B2 (en) * | 2002-11-26 | 2008-11-04 | Brother Kogyo Kabushiki Kaisha | Optical scanning apparatus and image forming apparatus |
-
2004
- 2004-03-26 JP JP2004090890A patent/JP4461870B2/ja not_active Expired - Fee Related
-
2005
- 2005-03-09 WO PCT/JP2005/004040 patent/WO2005093491A1/ja active Application Filing
-
2006
- 2006-09-26 US US11/526,734 patent/US7639413B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002174794A (ja) * | 2000-12-07 | 2002-06-21 | Denso Corp | 光スキャナ |
JP2002250890A (ja) * | 2001-02-22 | 2002-09-06 | Canon Inc | マイクロ構造体、マイクロ光偏向器、光走査型表示装置、及びそれらの製造方法 |
JP2003057586A (ja) * | 2001-08-20 | 2003-02-26 | Brother Ind Ltd | 光走査装置、光走査装置に用いられる振動体及び光走査装置を備えた画像形成装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2005275198A (ja) | 2005-10-06 |
JP4461870B2 (ja) | 2010-05-12 |
US20070070481A1 (en) | 2007-03-29 |
US7639413B2 (en) | 2009-12-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2005093491A1 (ja) | 光走査装置およびそれを備えた画像形成装置 | |
US7515329B2 (en) | Driving a MEMS scanner with a combined actuator drive signal | |
JP4461654B2 (ja) | 光走査装置、光走査装置に用いられる振動体及び光走査装置を備えた画像形成装置 | |
JP4935013B2 (ja) | 光走査装置、画像表示装置及び光スキャナの共振周波数変更方法並びに反射ミラー位置の補正方法 | |
EP1719012B1 (en) | Mems scanning system with improved performance | |
JP4574396B2 (ja) | 光偏向器 | |
US9405121B2 (en) | Image display apparatus and head-mounted display | |
JP4840058B2 (ja) | 光走査装置及びそれを備えた画像表示装置並びに網膜走査型画像表示装置、及び光走査素子の駆動方法 | |
JP3956839B2 (ja) | 光走査装置および光走査装置を備えた画像形成装置 | |
WO2010035469A1 (ja) | 光スキャナ及びこの光スキャナを備えた画像表示装置 | |
WO2012115264A1 (ja) | 光走査装置 | |
JP2004191953A (ja) | 光走査装置および画像形成装置 | |
WO2005059624A1 (ja) | 光スキャナおよびそれを備えた画像形成装置 | |
WO2005033771A1 (ja) | 光スキャナおよびそれを備えた画像形成装置 | |
US7582219B1 (en) | Method of fabricating reflective mirror by wet-etch using improved mask pattern and reflective mirror fabricated using the same | |
WO2011108395A1 (ja) | 光走査装置及びそれを備えた画像表示装置 | |
JP4447963B2 (ja) | 光偏向器制御装置 | |
JP4389740B2 (ja) | 振動体制御装置、それを備えた画像形成装置および揺動型スキャナ制御方法 | |
JP2019082527A (ja) | アクチュエーター、光学装置及びプロジェクター | |
JP2005338241A (ja) | 揺動体およびこれを用いた画像形成装置、スペックル低減方法 | |
JP4645067B2 (ja) | 反射ミラー製作方法 | |
WO2005119337A1 (ja) | ミラー駆動装置およびそれを備えた網膜走査型ディスプレイ | |
JP2007025607A (ja) | 光走査装置、画像表示装置、光走査装置又は画像表示装置における反射ミラーの位置調節方法及び揺動状態検出方法 | |
JP2011053253A (ja) | 光スキャナ | |
CN116472485A (zh) | 带外部致动器的微机械谐振器组件 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SM SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 11526734 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 11526734 Country of ref document: US |
|
122 | Ep: pct application non-entry in european phase |