摘要:
In a lens barrier device, one barrier blade is arranged at a different height in the optical axis direction from another barrier blade, and a barrier base is provided with a regulating portion which is at the outer peripheral portion of an optical axis forward end side barrier blade and which regulates the position in the optical direction of the optical axis forward end side barrier blade, thus forming the lens barrier device as a unit. If rotation shafts for the barrier blades are formed on an external cover, deformation or the like would be generated when the external cover is assembled to the apparatus, resulting in an increase in the requisite drive force for the opening/closing operation. Hence, it is possible to prevent a suitable opening/closing operation from being hindered by such an increase in the requisite drive force.
摘要:
An easy-to-manufacture spindle motor having an aligning mechanism whose precision is equal to that of cutting of metallic materials without entailing an extra cost is to be provided. An aligning mechanism which is in contact with the center hole of a disk-shaped recording medium and comprises a turntable and an aligning member whose aligning member has a sliding portion which can be slidably fitted into a guide portion disposed on the turntable, wherein at least one of the respective sliding faces of the guide portion disposed on the turntable and the aligning member is configured of a metallic component, and other parts than the metallic component or components of the turntable and/or aligning member are configured of resin materials.
摘要:
Provided is a spatial light modulator SLM and a photodetector element CMOS sensor are placed on the same chip, and the alignment thereof and a relay lens system are eliminated, whereby an optical system is reduced in cost and made compact. Specifically, provided is an optical information recording and reproducing apparatus for recording information by allowing information light and reference light to interfere with each other and reproducing the information using the reference light including: a light source; a spatial light modulator for generating at least an information light with respect to a light beam from the light source; an objective lens for irradiating a recording medium with the light beam from the spatial light modulator; and a photodetector element for receiving a reproduction light from the recording medium, in which the spatial light modulator and the photodetector element are formed on the same semiconductor substrate.
摘要:
An easy-to-manufacture spindle motor has an aligning mechanism whose precision is equal to that of cutting of metallic materials without entailing an extra cost. The aligning mechanism is in contact with the center hole of a disk-shaped recording medium and comprises a turntable and an aligning member that has a sliding portion which can be slidably fitted into a guide portion disposed on the turntable. At least one of respective sliding faces of the guide portion disposed on the turntable and the aligning member is configured of a metallic component, and parts other than the metallic component or components of the turntable and/or aligning member are configured of resin materials.
摘要:
A lens barrier device includes a first barrier blade including a shielding portion, a connection portion, and an abutment portion. The abutment portion is connected, on an optical axis imaging surface side of the shielding portion, to the shielding portion via the connecting portion. Further, a second barrier blade is provided on an optical axis imaging surface side with respect to the shielding portion. A regulating portion is provided whose optical axis imaging surface side is configured to contact the abutment portion, wherein an outer peripheral portion of the second barrier blade, the connecting portion, and the abutment portion are located in this order from an optical axis center to an optical axis outer side.
摘要:
In a lens barrier device, one barrier blade is arranged at a different height in the optical axis direction from another barrier blade, and a barrier base is provided with a regulating portion which is at the outer peripheral portion of an optical axis forward end side barrier blade and which regulates the position in the optical direction of the optical axis forward end side barrier blade, thus forming the lens barrier device as a unit. If rotation shafts for the barrier blades are formed on an external cover, deformation or the like would be generated when the external cover is assembled to the apparatus, resulting in an increase in the requisite drive force for the opening/closing operation. Hence, it is possible to prevent a suitable opening/closing operation from being hindered by such an increase in the requisite drive force.
摘要:
A disk camcorder includes an image pickup optical system including an image pickup element, a memory for temporarily storing recorded information from the image pickup element, and a recording/reproduction unit which records the recording information stored in the memory onto a disk-shaped recording medium through an intermittent operation or reproduces the recording information recorded onto the disk-shaped recording medium through an intermittent operation, and temporarily stores the recording information. The disk camcorder has a plurality of modes including a first mode in which the recording medium is irradiated with light flux having a first laser power for a first time period, and a second mode in which the recording medium is irradiated with light flux having a second laser power lower than the first laser power, for a second time period, longer than the first time period.
摘要:
An aligning device for a disk recording medium capable of reducing eccentricity using a simple structure, without an increase in cost, is provided. An aligning member has a tapered portion that contacts with a center hole of a disk, and fits with a guide portion that is fixed to a turntable with a sliding gap therebetween. The sliding gap between the aligning member and the guide portion is formed such that a leading end side sliding gap of the turntable in the sliding direction of the aligning member differs from a trailing end side sliding gap of the disk side in the sliding direction. The leading end side sliding gap is formed smaller than the trailing end side sliding gap. The amount of eccentricity of the disk becomes smaller according to this structure.
摘要:
There is provided an optical information recording/reproducing apparatus including a unit for detecting the focus error signal from the reflected light flux from a recording layer of an optical recording medium, and a unit for focusing the light flux on the recording layer of the optical disk on the basis of the focus error signal. In the case of detecting the focus error signal, the light flux of the effective numeric aperture NAeff
摘要:
It can be determined whether a disc is a single-layer disc or a multilayer disc without causing reproducing deterioration while only a main body of the disc is used without being contained in a cartridge. More specifically, when disc type determination is performed, an intensity of laser light (reproducing light quantity) irradiated to the disc is set to a first light quantity for reproducing information from the disc having a signal recording surface of a single layer.