摘要 |
The present invention is for providing optical head apparatus that can control scatter occurring at locations along the length of the optical path, when laser beam is transmitted through prism constituting the No. 1 prism structural member and the No. 2 prism structural member joined through partially reflecting face. Optical head apparatus 1 performs information recording, information regeneration on an optical recording medium, e.g. DVD; laser beam emitted from laser beam-emitting element is transmitted through a prism. The prism has the structure wherein triangular the No. 1 prism structural member and similarly a triangular No. 2 prism structural member are joined through partially reflecting face. When length of laser beam in optical path direction in prism and absolute value of the difference in refractive index between a No. 1 prism structural member and a No. 2 prism structural member are respectively termed d, Deltan, and wavelength of laser beam is termed lambda, within effective pupil in prism, Deltan.d is less than 5 times the wavelength lambda of laser beam.
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