Hologram recording method and hologram recording apparatus
First Claim
Patent Images
1. A hologram recording method comprising:
- irradiating an optical recording medium with a signal light beam and a reference light beam at the same time; and
performing multiple recording of information of the signal light beam as a hologram of a plurality of pages in the optical recording medium by changing a recording angle while changing an angle formed between the signal light beam and the reference light beam, wherein each page of the hologram is newly recorded at a recording angle different from a recording angle of each page of a hologram previously recorded in the optical recording medium.
2 Assignments
0 Petitions
Accused Products
Abstract
Quality of a reproduced light beam is improved, and rewriting and recording are performed at high speed without erasing data. Each page of a hologram is newly recorded so that the maximum point of diffraction light beam intensity in reproducing the newly recorded hologram is located at a position where diffraction light beam intensity from a data page of a hologram which has been previously recorded in a hologram recording medium is minimized at the time of reproducing the data.
17 Citations
35 Claims
-
1. A hologram recording method comprising:
-
irradiating an optical recording medium with a signal light beam and a reference light beam at the same time; and
performing multiple recording of information of the signal light beam as a hologram of a plurality of pages in the optical recording medium by changing a recording angle while changing an angle formed between the signal light beam and the reference light beam, wherein each page of the hologram is newly recorded at a recording angle different from a recording angle of each page of a hologram previously recorded in the optical recording medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A hologram recording method comprising:
-
irradiating an optical recording medium with a signal light beam and a reference light beam at the same time while making an angle formed between the signal light beam and the reference light beam a constant value; and
performing multiple recording of information of the signal light beam as a hologram of a plurality of pages in the optical recording medium, in such a manner that a recording position is changed while relatively moving at least one of (A) the signal light beam and the reference light beam, and (B) the optical recording medium, wherein each page of the hologram is newly recorded at a recording position different from a recording position of each page of a hologram previously recorded in the optical recording medium. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A hologram recording method comprising:
-
irradiating an optical recording medium with a signal light beam and a reference light beam at the same time while changing wavelengths of the signal light beam and the reference light beam, in such a manner that an angle formed between the signal light beam and the reference light beam is made a constant value; and
performing multiple recording of information of the signal light beam as a hologram of a plurality of pages in the optical recording medium, wherein each page of the hologram is newly recorded by using the signal light beam and the reference light beam, which have wavelengths different from wavelengths at the time of recording each page of a hologram previously recorded in the optical recording medium. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A hologram recording apparatus which multiple-records information of a signal light beam as a hologram of a plurality of pages in an optical recording medium, wherein the hologram recording apparatus changes a recording angle by irradiating the optical recording medium with a signal light beam and a reference light beam at the same time while changing an angle formed between the signal light beam and the reference light beam, such that each page of the hologram is newly recorded at a recording angle different from a recording angle of each page of a hologram previously recorded in the optical recording medium.
-
29. A hologram recording apparatus which multiple-records information of a signal light beam as a hologram of a plurality of pages in an optical recording medium, wherein the hologram recording apparatus makes an angle formed between the signal light beam and a reference light beam a constant value and changes a recording position by irradiating the optical recording medium with the signal light beam and the reference light beam at the same time while relatively moving at least one of (A) the signal light beam and the reference light beam, and (B) the optical recording medium, such that each page of the hologram is newly recorded at a recording position different from a recording position of each page of a hologram previously recorded in the optical recording medium.
-
30. A hologram recording apparatus which multiple records information of a signal light beam as a hologram of a plurality of pages in an optical recording medium, wherein the hologram recording apparatus makes an angle formed between the signal light beam and a reference light beam a constant value and irradiates the optical recording medium with the signal light beam and the reference light beam at the same time while changing wavelengths of the signal light beam and the reference light beam, such that each page of the hologram is newly recorded by using the signal light beam and the reference light beam, which have wavelengths different from wavelengths at the time of recording each page of a hologram previously recorded in the optical recording medium.
-
31. A hologram recording apparatus comprising:
-
a light source for emitting a coherent light beam;
a stage which rotates or moves an optical recording medium;
a light beam separating optical path changing device which changes an optical path so that the optical recording medium is irradiated with a reference light beam and a signal light beam at the same time after the coherent light beam is separated into a light beam for the reference light beam and a light beam for the signal light beam;
a spatial light modulator which is arranged on the optical path of the light beam for the signal light beam, and modulates the light beam for the signal light beam according to a supplied recording signal for each page so as to generate a signal light beam for recording each page of a hologram; and
a signal supplying device which supplies the recording signal for each page to the spatial light modulator so that each page of the hologram is recorded at a position where a maximum point of light beam intensity of a reproduced light beam is shifted by a predetermined amount when each page of the recorded hologram is reproduced, and newly supplies the recording signal for each page to the spatial light modulator so that each page of the hologram is newly recorded at a recording position which is different from a recording position of each page of a hologram previously recorded in the optical recording medium. - View Dependent Claims (32, 33, 34, 35)
-
Specification