WO2014064964A1 - Optical scanning device and light source device - Google Patents

Optical scanning device and light source device Download PDF

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Publication number
WO2014064964A1
WO2014064964A1 PCT/JP2013/067208 JP2013067208W WO2014064964A1 WO 2014064964 A1 WO2014064964 A1 WO 2014064964A1 JP 2013067208 W JP2013067208 W JP 2013067208W WO 2014064964 A1 WO2014064964 A1 WO 2014064964A1
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WO
WIPO (PCT)
Prior art keywords
light
laser light
pattern
mirror
optical scanning
Prior art date
Application number
PCT/JP2013/067208
Other languages
French (fr)
Japanese (ja)
Inventor
祐一 宮本
Original Assignee
浜松ホトニクス株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2012235007A priority Critical patent/JP2014085548A/en
Priority to JP2012-235007 priority
Application filed by 浜松ホトニクス株式会社 filed Critical 浜松ホトニクス株式会社
Publication of WO2014064964A1 publication Critical patent/WO2014064964A1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Other optical systems; Other optical apparatus
    • G02B27/48Laser speckle optics; Speckle reduction arrangements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B26/00Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating
    • G02B26/08Optical devices or arrangements using movable or deformable optical elements for controlling the intensity, colour, phase, polarisation or direction of light, e.g. switching, gating, modulating for controlling the direction of light
    • G02B26/10Scanning systems
    • G02B26/105Scanning systems with one or more pivoting mirrors or galvano-mirrors
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/31Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen

Abstract

In a light source device (1), the positions where laser light passes through a light transmitting member (15) can be scanned by using a pattern modulation drive mirror (16) in an optical scanning device (4). Non-light-transmitting sections (15a) are arranged in a prescribed pattern on the light transmitting member (15), and the pattern of the non-light-transmitting sections (15a) in a light transmitting region of the laser light is altered by the position of the laser light. Thus, the brightness pattern of the laser light changes over time, and even if the laser light from the light source device (1) is scattered by a screen (P), interference in the human retina is suppressed, enabling speckle noise to be reduced. Furthermore, in the optical scanning device (4), laser light is scanned by the pattern modulation drive mirror (16); thus, the brightness pattern of the laser light can be stably altered compared to the situation in which light transmitting member (15) itself is driven at high speed.

Description

Optical scanning device and light source device

The present invention relates to an optical scanning device and a light source device.

For example, in an optical scanning device used in a laser projector or the like, a laser beam modulated by an image signal is scanned by driving a mirror, and an image is displayed on a screen. In such an optical scanning device, it is a technical problem to reduce speckle noise. Speckle noise is a phenomenon in which scattered light interferes with a human retina due to scattering of laser light due to unevenness of a screen or the like, thereby causing image flicker or the like.

In response to such a problem, conventionally, a technique for reducing speckle noise by arranging a drive type diffusion plate on the optical path has been used. However, it has been difficult to apply a method using a diffusion plate to a laser projector of a type that scans parallel light on a screen. On the other hand, for example, in the image display device described in Patent Document 1, a light transmission plate that temporally changes the phase of a part of the laser light is disposed on the optical path.

JP 2010-152066 A

In the image display device described in Patent Document 1 described above, regions having different refractive indexes are mixed in the peripheral portion of the laser light transmission region in the light transmission plate, and the laser light transmission is performed by rotating the light transmission plate. The phase of the laser beam changes irregularly at the periphery of the region. In this method, speckle noise is reduced by a change in the phase of the laser beam. However, in order to sufficiently reduce speckle noise, it is necessary to drive the light transmission plate itself at high speed, and driving stability is improved. It seems to be a problem.

The present invention has been made to solve the above problems, and an object thereof is to provide an optical scanning device capable of stably reducing speckle noise and a light source device using the same.

In order to solve the above problems, an optical scanning device according to the present invention includes a first collimating lens that collimates laser light modulated by a projection signal, and laser light that has been collimated by the first collimating lens. A signal scanning drive mirror that scans toward the object, and a light transmitting member in which a light non-transmitting portion is arranged in a predetermined pattern in front of the first collimating lens; A pattern modulation drive mirror that scans toward the member is arranged.

In this optical scanning device, the position where the laser light passes through the light transmitting member can be scanned by using the pattern modulation drive mirror. At this time, since the light non-transmission portion is arranged in a predetermined pattern on the light transmission member, the pattern of the light non-transmission portion in the laser light transmission region changes depending on the position of the laser light with respect to the light transmission member. Thereby, since the luminance pattern of the laser light changes with time, even if the laser light from the optical scanning device is scattered by a screen or the like, interference in the human retina is suppressed and speckle noise can be reduced. Further, in this optical scanning device, since the laser light is scanned by the pattern modulation drive mirror, the luminance pattern of the laser light can be changed stably as compared with the case where the light transmitting member itself is driven at a high speed.

The signal scanning drive mirror and the pattern modulation drive mirror are MEMS mirrors, and the drive frequency of the pattern modulation drive mirror is preferably higher than the drive frequency of the signal scan drive mirror. By using the MEMS mirror as the signal scanning drive mirror and the pattern modulation drive mirror, both mirrors can be driven stably at a high frequency. Also, by making the drive frequency of the pattern modulation drive mirror higher than the drive frequency of the signal scanning drive mirror, the change rate of the laser light luminance pattern can be sufficiently secured relative to the scanning speed of the projection signal, and the spec. Noise can be reduced more reliably.

Further, it is preferable to further include a drive unit that drives the light transmitting member in a direction crossing the optical axis of the laser beam. In this case, since the luminance pattern of the laser beam can be changed more quickly, speckle noise can be further effectively reduced.

A second collimating lens for collimating the laser light reflected by the pattern modulation drive mirror is disposed between the pattern modulation drive mirror and the light transmission member. It is preferable that a first condensing lens that condenses the laser light transmitted through the transmissive member toward the first collimating lens is disposed. In this case, the laser light passing through the light transmitting member can be parallel light having a certain diameter. Therefore, the laser beam can be more reliably passed through the pattern of the light non-transmissive portion.

A light source device according to the present invention includes the optical scanning device, a plurality of light sources that emit laser light, and a second condenser lens that condenses the light emitted from the light source toward the pattern modulation drive mirror. It is characterized by having.

In this light source device, the position where the laser light passes through the light transmitting member can be scanned by using the pattern modulation drive mirror. At this time, since the light non-transmission portion is arranged in a predetermined pattern on the light transmission member, the pattern of the light non-transmission portion in the laser light transmission region changes depending on the position of the laser light with respect to the light transmission member. Thereby, since the luminance pattern of the laser light changes with time, even if the laser light from the light source device is scattered by a screen or the like, interference in the human retina is suppressed and speckle noise can be reduced. In this light source device, since the laser beam is scanned by the pattern modulation drive mirror, the luminance pattern of the laser beam can be changed stably as compared with the case where the light transmitting member itself is driven at a high speed.

According to the present invention, speckle noise can be stably reduced.

It is a figure which shows one Embodiment of the light source device formed by applying the optical scanning device which concerns on this invention. It is a figure which shows an example of a light transmissive plate. It is a figure which shows the mode of the laser beam scanned on a light transmissive plate. It is a figure which shows the modification of a light transmissive plate.

Hereinafter, preferred embodiments of an optical scanning device and a light source device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a light source device to which an optical scanning device according to the present invention is applied. As shown in FIG. 1, the light source device 1 includes a plurality of light sources 2, a condenser lens (second condenser lens) 3, and an optical scanning device 4. The light source device 1 is used, for example, as an optical engine of a laser projector device, and displays an image on a screen (object) P by scanning a laser beam modulated by a projection signal by driving a mirror. It is.

The light source 2 is composed of units of light sources 2a, 2b, and 2c that emit laser light corresponding to wavelengths of RGB colors. The laser beams emitted from the light sources 2 a, 2 b, 2 c are combined by the half mirrors 5, 6 and guided to the condenser lens 3. The condensing lens 3 is disposed at the subsequent stage of the half mirror 6. The condensing lens 3 condenses the synthesized laser light toward a pattern modulation drive mirror 16 described later. The light source 2 may be provided with a polarizing filter or an interference filter (bandpass filter) that cuts the return light. By cutting the return light, it is possible to prevent the light source 2 from being defective.

The optical scanning device 4 incorporated in the light source device 1 includes a collimating lens (first collimating lens) 11 and a signal scanning drive mirror 12 as a configuration for scanning the screen P with laser light. . The optical scanning device 4 includes a collimating lens (second collimating lens) 13 and a condensing lens (first condensing lens) 14 as a configuration for performing pattern modulation of laser light incident from the light source device 1. And a light transmission member 15 and a pattern modulation drive mirror 16.

The collimating lens 11 is a lens that collimates the laser light modulated by the projection signal. The collimator lens 11 is arranged at the rear stage of the condenser lens 14, and collimates the laser light collected by the condenser lens 14 so as to enter the signal scanning drive mirror 12.

The signal scanning drive mirror 12 is an electromagnetically driven optical mirror manufactured using, for example, MEMS (Micro Electro Mechanical Systems) technology. The signal scanning drive mirror 12 is rotatable at a predetermined frequency based on a control signal from a drive control unit (not shown). Thereby, the laser beam collimated by the collimating lens 11 is scanned on the screen P, and an image for projection is displayed on the screen P. The drive frequency of the signal scanning drive mirror 12 is, for example, about 20 kHz.

The collimating lens 13 is a lens that collimates the laser light modulated by the projection signal, like the collimating lens 11. The collimating lens 13 is arranged at the subsequent stage of the pattern modulation driving mirror 16, and collimates the laser light collected by the condensing lens 3 and makes it incident on the light transmitting member 15. Note that the diameter of the parallel light formed by the collimating lens 13 is preferably larger than the diameter of the parallel light formed by the collimating lens 11. On the other hand, the condensing lens 14 is arranged at the rear stage of the light transmission member 15. The condensing lens 14 condenses the laser light transmitted through the light transmitting member 15 toward the collimating lens.

The light transmitting member 15 is a member in which light non-transmitting portions are arranged in a predetermined pattern. As shown in FIG. 2, the light transmitting member 15 is formed, for example, by attaching a film on which the light non-transmitting portion 15 a is printed in a predetermined pattern to one surface side of the glass plate 17. The light non-transmitting portion 15a has a substantially circular shape with a sufficiently small diameter with respect to the diameter of the laser beam collimated by the collimating lens 13, for example, and is arranged in a random pattern over substantially the entire one surface side of the glass plate 17. Yes. The light non-transmitting portion 15a does not necessarily need to completely shield the laser light, and may have a sufficiently small light transmittance with respect to the glass plate 17 that is the light transmitting portion.

Further, as shown in FIG. 1, the light transmitting member 15 is provided with a drive unit 18 that drives the light transmitting member 15 in a direction intersecting the optical axis of the laser light. The drive unit 18 is, for example, a ceramic vibrator or an electrostatic actuator, and drives the light transmission member 15 in the in-plane direction at a predetermined frequency. The drive frequency of the drive unit 18 is preferably not an integral multiple of the drive frequencies of the signal scanning drive mirror 12 and the pattern modulation mirror 16. The driving width of the light transmitting member 15 by the driving unit 18 is not particularly limited, but is preferably equal to or larger than the diameter of the light non-transmitting unit 15a, for example.

The pattern modulation drive mirror 16 is an electromagnetically driven optical mirror manufactured by using the MEMS technology, similarly to the signal scanning drive mirror 12. The pattern modulation drive mirror 16 is disposed in front of the collimator lens 13 and the light transmission member 15 and is rotatable at a predetermined frequency based on a control signal from a drive control unit (not shown). As a result, the laser beam converted into parallel light by the collimator lens 13 is scanned onto the light transmission member 15.

As the pattern modulation drive mirror 16 scans the laser beam, the position of the laser beam on the light transmitting member 15 changes. At this time, since the light non-transmission portions 15a are arranged in a random pattern on the light transmission member 15, for example, the positions of the laser light with respect to the light transmission member 15 are A, B, and C as shown in FIG. As it changes, the pattern of the light non-transmission part 15a in the laser light transmission region (the number, position, etc. of the light non-transmission parts 15a located in the laser light transmission region) changes with time. . Further, the position at which the laser beam transmitted through the light transmitting member 15 enters the signal scanning drive mirror 12 also changes with time (see FIG. 1). The drive frequency of the pattern modulation drive mirror 16 is preferably greater than the drive frequency of the signal scanning drive mirror 12 and not an integral multiple.

As described above, in the light source device 1, the position at which the laser light passes through the light transmitting member 15 can be scanned by using the pattern modulation drive mirror 16 in the optical scanning device 4. Since the light non-transmission portion 15a is arranged in a predetermined pattern in the light transmission member 15, the pattern of the light non-transmission portion 15a in the laser light transmission region varies depending on the position of the laser light with respect to the light transmission member 15. To do. Thereby, since the luminance pattern of the laser light changes with time, even if the laser light from the light source device 1 is scattered by the screen P, interference in the human retina is suppressed and speckle noise can be reduced. In the light source device 1, the position at which the laser light transmitted through the light transmitting member 15 enters the signal scanning drive mirror 12 also changes with time by scanning the laser light with the pattern modulation drive mirror 16. This also contributes to further reduction of speckle noise. Further, in this optical scanning device 4, since the laser beam is scanned by the pattern modulation drive mirror 16, the luminance pattern of the laser beam can be changed stably as compared with the case where the light transmitting member 15 itself is driven at a high speed. it can.

In the light source device 1, the signal scanning drive mirror 12 and the pattern modulation drive mirror 16 are MEMS mirrors, and the drive frequency of the pattern modulation drive mirror 16 is higher than the drive frequency of the signal scan drive mirror 12. Yes. Thus, by using the MEMS mirror, both mirrors can be driven stably at a high frequency. In addition, by making the drive frequency of the pattern modulation drive mirror 16 greater than the drive frequency of the signal scanning drive mirror 12, it is possible to sufficiently secure the change speed of the luminance pattern of the laser beam with respect to the scanning speed of the projection signal. Speckle noise can be reduced more reliably.

Further, the light source device 1 is provided with a drive unit 18 that drives the light transmitting member 15 in a direction intersecting the optical axis of the laser light. Since the drive unit 18 can change the luminance pattern of the laser light more quickly, speckle noise can be more effectively reduced.

In the light source device 1, a collimator lens 13 that collimates the laser light reflected by the pattern modulation drive mirror 16 is disposed between the pattern modulation drive mirror 16 and the light transmission member 15. A condensing lens 14 that condenses the laser light transmitted through the light transmitting member 15 toward the collimating lens 11 is disposed at the subsequent stage. With such a configuration, the laser light passing through the light transmitting member 15 can be converted into parallel light having a certain diameter. Therefore, the laser beam can be more reliably passed through the pattern of the light non-transmissive portion 15a.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, a plurality of light sources that emit laser light corresponding to the wavelengths of RGB colors are illustrated, but the number of light sources can be selected as appropriate. In the above embodiment, the light transmitting member 15 in which the light non-transmitting portions 15a are arranged in a random pattern is illustrated. However, the pattern of the light non-transmitting portions is scanned by the laser beam by the pattern modulation drive mirror 16. Any other form may be used as long as it changes with respect to the laser light transmission region. As another pattern of the light non-transmissive portion, for example, as shown in FIG. 4A, substantially circular light non-transmissive portions 15b may be arranged at equal intervals. As shown, it may be a light non-transmissive portion 15c having a lattice shape. Moreover, as shown in FIG.4 (c), the light non-transmission part 15d which makes the oblique line shape may be arrange | positioned over several rows.

DESCRIPTION OF SYMBOLS 1 ... Light source device, 2 (2a, 2b, 2c) ... Light source, 3 ... Condensing lens (2nd condensing lens), 4 ... Optical scanning device, 11 ... Collimating lens (1st collimating lens), 12 ... Signal scanning drive mirror, 13 ... collimating lens (second collimating lens), 14 ... condensing lens (first condensing lens), 15 ... light transmitting member, 15a to 15d ... light non-transmitting portion, 16 ... pattern Modulation drive mirror, 18... Drive unit.

Claims (5)

  1. A first collimating lens that collimates the laser light modulated by the projection signal;
    A signal scanning drive mirror that scans the laser beam collimated by the first collimating lens toward an object;
    In front of the first collimating lens, a light transmitting member in which a light non-transmitting portion is arranged in a predetermined pattern, and a pattern modulation driving mirror for scanning the laser light toward the light transmitting member are arranged. An optical scanning device characterized by comprising:
  2. The signal scanning drive mirror and the pattern modulation drive mirror are MEMS mirrors,
    2. The optical scanning device according to claim 1, wherein a driving frequency of the pattern modulation driving mirror is higher than a driving frequency of the signal scanning driving mirror.
  3. 3. The optical scanning device according to claim 1, further comprising a drive unit that drives the light transmitting member in a direction intersecting an optical axis of the laser light.
  4. Between the pattern modulation drive mirror and the light transmission member, a second collimating lens for collimating the laser light reflected by the pattern modulation drive mirror is disposed,
    The first condenser lens for condensing the laser light transmitted through the light transmissive member toward the first collimator lens is disposed at a subsequent stage of the light transmissive member. The optical scanning device according to any one of claims 1 to 3.
  5. An optical scanning device according to any one of claims 1 to 4,
    A plurality of light sources for emitting the laser light;
    And a second condenser lens for condensing the light emitted from the light source toward the pattern modulation drive mirror.
PCT/JP2013/067208 2012-10-24 2013-06-24 Optical scanning device and light source device WO2014064964A1 (en)

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JP2012-235007 2012-10-24

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106226984A (en) * 2016-09-07 2016-12-14 海信集团有限公司 A kind of LASER Light Source, laser projection device
US9622861B2 (en) 2009-12-02 2017-04-18 Valtech Cardio, Ltd. Tool for actuating an adjusting mechanism
US9724192B2 (en) 2011-11-08 2017-08-08 Valtech Cardio, Ltd. Controlled steering functionality for implant-delivery tool
US9730793B2 (en) 2012-12-06 2017-08-15 Valtech Cardio, Ltd. Techniques for guide-wire based advancement of a tool
US9775709B2 (en) 2011-11-04 2017-10-03 Valtech Cardio, Ltd. Implant having multiple adjustable mechanisms
US9872769B2 (en) 2006-12-05 2018-01-23 Valtech Cardio, Ltd. Implantation of repair devices in the heart
US9883943B2 (en) 2006-12-05 2018-02-06 Valtech Cardio, Ltd. Implantation of repair devices in the heart
US9937042B2 (en) 2009-05-07 2018-04-10 Valtech Cardio, Ltd. Multiple anchor delivery tool
US9968452B2 (en) 2009-05-04 2018-05-15 Valtech Cardio, Ltd. Annuloplasty ring delivery cathethers
US9968454B2 (en) 2009-10-29 2018-05-15 Valtech Cardio, Ltd. Techniques for guide-wire based advancement of artificial chordae
US10098737B2 (en) 2009-10-29 2018-10-16 Valtech Cardio, Ltd. Tissue anchor for annuloplasty device
US10195030B2 (en) 2014-10-14 2019-02-05 Valtech Cardio, Ltd. Leaflet-restraining techniques
US10226342B2 (en) 2016-07-08 2019-03-12 Valtech Cardio, Ltd. Adjustable annuloplasty device with alternating peaks and troughs
US10265170B2 (en) 2013-12-26 2019-04-23 Valtech Cardio, Ltd. Implantation of flexible implant
US10299793B2 (en) 2013-10-23 2019-05-28 Valtech Cardio, Ltd. Anchor magazine
US10350068B2 (en) 2009-02-17 2019-07-16 Valtech Cardio, Ltd. Actively-engageable movement-restriction mechanism for use with an annuloplasty structure
US10470882B2 (en) 2008-12-22 2019-11-12 Valtech Cardio, Ltd. Closure element for use with annuloplasty structure
US10517719B2 (en) 2016-02-12 2019-12-31 Valtech Cardio, Ltd. Implantation of repair devices in the heart

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JP2008152116A (en) * 2006-12-19 2008-07-03 Lasertec Corp Lighting device and method
JP2009251004A (en) * 2008-04-01 2009-10-29 Seiko Epson Corp Image display apparatus
JP2010151870A (en) * 2008-12-24 2010-07-08 Seiko Epson Corp Scanning image display device
JP2012247744A (en) * 2011-05-31 2012-12-13 Hitachi Media Electoronics Co Ltd Scanning display device

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JP2008152116A (en) * 2006-12-19 2008-07-03 Lasertec Corp Lighting device and method
JP2009251004A (en) * 2008-04-01 2009-10-29 Seiko Epson Corp Image display apparatus
JP2010151870A (en) * 2008-12-24 2010-07-08 Seiko Epson Corp Scanning image display device
JP2012247744A (en) * 2011-05-31 2012-12-13 Hitachi Media Electoronics Co Ltd Scanning display device

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9872769B2 (en) 2006-12-05 2018-01-23 Valtech Cardio, Ltd. Implantation of repair devices in the heart
US10357366B2 (en) 2006-12-05 2019-07-23 Valtech Cardio, Ltd. Implantation of repair devices in the heart
US9974653B2 (en) 2006-12-05 2018-05-22 Valtech Cardio, Ltd. Implantation of repair devices in the heart
US9883943B2 (en) 2006-12-05 2018-02-06 Valtech Cardio, Ltd. Implantation of repair devices in the heart
US10363137B2 (en) 2006-12-05 2019-07-30 Valtech Cardio, Ltd. Implantation of repair devices in the heart
US10470882B2 (en) 2008-12-22 2019-11-12 Valtech Cardio, Ltd. Closure element for use with annuloplasty structure
US10350068B2 (en) 2009-02-17 2019-07-16 Valtech Cardio, Ltd. Actively-engageable movement-restriction mechanism for use with an annuloplasty structure
US9968452B2 (en) 2009-05-04 2018-05-15 Valtech Cardio, Ltd. Annuloplasty ring delivery cathethers
US9937042B2 (en) 2009-05-07 2018-04-10 Valtech Cardio, Ltd. Multiple anchor delivery tool
US9968454B2 (en) 2009-10-29 2018-05-15 Valtech Cardio, Ltd. Techniques for guide-wire based advancement of artificial chordae
US10098737B2 (en) 2009-10-29 2018-10-16 Valtech Cardio, Ltd. Tissue anchor for annuloplasty device
US9622861B2 (en) 2009-12-02 2017-04-18 Valtech Cardio, Ltd. Tool for actuating an adjusting mechanism
US10492909B2 (en) 2009-12-02 2019-12-03 Valtech Cardio, Ltd. Tool for actuating an adjusting mechanism
US10363136B2 (en) 2011-11-04 2019-07-30 Valtech Cardio, Ltd. Implant having multiple adjustment mechanisms
US9775709B2 (en) 2011-11-04 2017-10-03 Valtech Cardio, Ltd. Implant having multiple adjustable mechanisms
US9724192B2 (en) 2011-11-08 2017-08-08 Valtech Cardio, Ltd. Controlled steering functionality for implant-delivery tool
US9730793B2 (en) 2012-12-06 2017-08-15 Valtech Cardio, Ltd. Techniques for guide-wire based advancement of a tool
US10299793B2 (en) 2013-10-23 2019-05-28 Valtech Cardio, Ltd. Anchor magazine
US10265170B2 (en) 2013-12-26 2019-04-23 Valtech Cardio, Ltd. Implantation of flexible implant
US10195030B2 (en) 2014-10-14 2019-02-05 Valtech Cardio, Ltd. Leaflet-restraining techniques
US10517719B2 (en) 2016-02-12 2019-12-31 Valtech Cardio, Ltd. Implantation of repair devices in the heart
US10226342B2 (en) 2016-07-08 2019-03-12 Valtech Cardio, Ltd. Adjustable annuloplasty device with alternating peaks and troughs
CN106226984A (en) * 2016-09-07 2016-12-14 海信集团有限公司 A kind of LASER Light Source, laser projection device

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