摘要:
The present invention provides an optical device including: a light source; an optical element to be irradiated with light emitted from the light source; and a supporting member for supporting the optical element through a cured product of an adhesive. This cured product of the adhesive contains a thermoplastic elastic material. The present invention also provides an optical device including: a light source; an optical element to be irradiated with light emitted from the light source; and a supporting member for supporting the optical element through a cured product of an adhesive. This cured product of the adhesive has a Young's modulus of at least 1.0E+5 Pa but less than 1.0E+7 Pa in an exponential expression, in a temperature range that the cured product of the adhesive reaches due to heat generation during operation.
摘要:
A dichroic mirror is a wedge-shaped quadrangular prism whose cross-section is a trapezoid having an upper base d and a lower base d+Δd. The dichroic mirror receives on its top surface parallel light emitted from a collimating lens and reflects, off the top surface, most of the parallel light towards a wavelength plate. Moreover, the dichroic mirror transmits, through the top surface, part of the parallel light to output the part of the parallel light from a bottom surface facing the top surface toward a front monitor. The dichroic mirror has, on the bottom surface thereof, an inclination of an angle φ with respect to the top surface in a direction where a normal vector N of the bottom surface intersects with an xy-plane formed of: an optical axis x of incident light from the collimating lens; and an optical axis y of light emitted towards the wavelength plate.
摘要:
An optical pickup device includes: a light source for emitting light in a first wavelength range; an optical element for transmitting the light; a supporting member for supporting the optical element through an adhesive; a first light blocking member for blocking the light emitted from the light source from entering the adhesive when the optical element guides the emitted light to the optical disc; and a second light blocking member for blocking the light reflected from the optical disc from entering the adhesive when the optical element guides the reflected light to the detector unit. In this optical pickup device, at least one of the first and second light blocking member blocks the light in the first wavelength range and transmits light in a second wavelength range.
摘要:
An optical head (30) comprises a blue-violet laser light source (1) for emitting a blue-violet laser beam, a mirror with a diffraction grating (5) for transmitting and reflecting the blue-violet laser beam at a predetermined ratio, and a front monitor sensor (24) for receiving transmitted light or reflected light from the mirror with a diffraction grating (5) and creating an APC signal for controlling an output of the blue-violet laser light source (1). The minor with a diffraction grating (5) includes a first surface (5a) which the blue-violet laser beam enters, and a second surface (5b) facing the first surface (5a). The first surface (5a) and the second surface (5b) are mutually parallel. A reflecting coat for transmitting and reflecting the blue-violet laser beam at a predetermined ratio is formed on the first surface (5a), and a diffraction grating is formed on the second surface (5b). According to the foregoing configuration, the laser power of the laser beam that is emitted from the light source can be accurately controlled.
摘要:
An optical head includes a blue-violet laser light source for emitting a blue-violet laser beam, a mirror with a diffraction grating for transmitting and reflecting the blue-violet laser beam at a predetermined ratio, and a front monitor sensor for receiving transmitted light or reflected light from the mirror with a diffraction grating and creating an APC signal for controlling an output of the blue-violet laser light source. The mirror with a diffraction grating includes a first surface which the blue-violet laser beam enters, and a second surface facing the first surface. The first surface and the second surface are mutually parallel. A reflecting coat for transmitting and reflecting the blue-violet laser beam at a predetermined ratio is formed on the first surface, and a diffraction grating is formed on the second surface.
摘要:
In an optical head operable to record to and read from an optical recording medium, a beam emitted by a light-emitting element is reflected toward the light-emitting element by a first reflective mirror, and this reflected beam is reflected toward the optical recording medium by a second reflective mirror and focused on a recording surface of the optical recording medium. In this case, the first reflective mirror blocks a principal ray of the beam traveling toward the optical recording medium from the second reflective mirror, and the second reflective mirror consists of a plurality of concentric annular mirrors centered on the principal ray of the beam and separated from each other by a predetermined interval.
摘要:
In a semiconductor device fabrication method using a fluidic self-assembly technique in which in a liquid, a plurality of semiconductor elements are mounted in a self-aligned manner on a substrate with a plurality of recessed portions formed therein, protruding potions that are inserted in the respective recessed portions of the substrate are formed in the lower portions of the respective semiconductor elements, the liquid in which the semiconductor elements have been spread is poured over the substrate intermittently, and the substrate is rotated in a period of time in which the liquid is not poured.
摘要:
An optical head, an optical disc device and an information processing device are capable of suppressing the amount of third-order astigmatism created upon recording or reproducing information on or from a multi-layer optical disc including at least three information recording surfaces. An objective lens satisfies a relationship of tc>(t0+tn)/2 assuming that t0 denotes the thickness of a light transmitting layer from the outer surface of the multi-layer optical disc to an information recording surface having the largest light transmitting layer thickness, tn denotes the thickness of a light transmitting layer from the outer surface of the multi-layer optical disc to an information recording surface having the smallest light transmitting layer thickness and tc denotes the thickness of a virtual light transmitting layer at which the absolute value of a third-order spherical aberration is minimum when blue-violet laser light is incident as parallel light on the objective lens.
摘要:
An optical head includes a blue-violet laser light source for emitting a blue-violet laser beam, a mirror with a diffraction grating for transmitting and reflecting the blue-violet laser beam at a predetermined ratio, and a front monitor sensor for receiving transmitted light or reflected light from the mirror with a diffraction grating and creating an APC signal for controlling an output of the blue-violet laser light source. The mirror with a diffraction grating includes a first surface which the blue-violet laser beam enters, and a second surface facing the first surface. The first surface and the second surface are mutually parallel. A reflecting coat for transmitting and reflecting the blue-violet laser beam at a predetermined ratio is formed on the first surface, and a diffraction grating is formed on the second surface.
摘要:
An optical pickup having a light-emitting element, an objective lens unit, a reflecting mirror and a light-receiving element, emits a beam onto an optical recording medium and uses a reflected beam to read recorded information. In the objective lens unit, a central part of a surface, facing the light-emitting element, of an objective lens disposed so that an optical axis is substantially aligned with a chief ray of the beam emitted by the light-emitting element, is a transmissive diffraction grating, and a central part of a surface of the objective lens that will face the optical recording medium is a convex mirror which bulges toward the light-emitting element. The reflecting mirror, which is annular and encompasses the optical axis of the objective lens, reflects toward the objective lens the beam from the light-emitting element that has passed through the transmissive diffraction grating and been reflected by the convex mirror. The light-receiving element receives first-order diffracted light, of the reflected beam from the recording medium, diffracted by the transmissive diffraction grating.