1. An ignition apparatus comprising:
two ignition plugs at a single cylinder, the ignition plug being applied with a high voltage from the ignition apparatus,
an iron core constituting a magnetic circuit,
a primary coil constituted by winding a primary copper wire around the iron core, and
a secondary coil constituted by winding a secondary copper wire around an outer periphery thereof, the primary coil and the secondary coil being contained in a case and thereafter sealed by an insulating member, wherein
the secondary coil is wound around a secondary bobbin,
the secondary bobbin includes a center tap terminal, and
the secondary coil is regularly wound until reaching the center tap terminal, and is wound therearound from a regular winding direction to an inverse winding direction after reaching the center tap.
2. An ignition apparatus comprising:
two ignition plugs at a single cylinder, the ignition plug being applied with a high voltage from the ignition apparatus directly attached onto an engine head cover for directly applying the high voltage,
an iron core constituting a magnetic circuit,
a primary coil constituted by winding a primary copper wire around the iron core, and
a secondary coil constituted by winding a secondary copper wire around an outer periphery thereof, the primary coil and the secondary coil being contained in a case and thereafter sealed by an insulating member, wherein
the secondary coil is wound around a secondary bobbin,
the secondary bobbin includes a center tap terminal at a center thereof,
the secondary coil is regularly wound until reaching the center tap terminal, and is wound therearound from a regular winding direction to an inverse winding direction after reaching the center tap, and
the center tap terminal is connected to the ground or a + electrode of a battery.
3. The ignition apparatus according to claim 1, further comprising:
an ON time voltage preventing diode arranged between the center tap terminal and the ground or the + electrode of the battery.
4. The ignition apparatus according to claim 1, further comprising:
a regularly winding secondary coil and an inversely winding secondary coil individually provided, and
the ON time voltage preventing diodes arranged between the respective center tap terminals and the ground or the + electrode of the battery.
5. The ignition apparatus according to claim 1, further comprising:
the ON time voltage preventing diodes arranged between terminals of the secondary bobbins and the ground or the + electrode of the battery.
6. The ignition apparatus according to claim 2, further comprising:
an ON time voltage preventing diode arranged between the center tap terminal and the ground or the + electrode of the battery.
7. The ignition apparatus according to claim 2, further comprising:
a regularly winding secondary coil and an inversely winding secondary coil individually provided, and
the ON time voltage preventing diodes arranged between the respective center tap terminals and the ground or the + electrode of the battery.
8. The ignition apparatus according to claim 2, further comprising:
the ON time voltage preventing diodes arranged between terminals of the secondary bobbins and the ground or the + electrode of the battery.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A projector, comprising:
a light beam dividing optical element that divides light from a light source into a plurality of partial light beams;
a polarization conversion element that converts the plurality of partial light beams into one type of polarized light beam polarized substantially in same directions;
an electro-optical device that modulates an illumination light beam emitted from the polarization conversion element;
a projection lens that projects light modulated by the electro-optical device; and
a polarization selection surface that selects light of a predetermined polarized component included in the illumination light beam, that emits the light toward the electro-optical device, that selects light of a predetermined polarized component in the light modulated by the electro-optical device and that emits the light toward the projection lens,
when a plane defined by a normal line of a polarization selection surface and a central axis of the illumination light beam is assumed to be a plane of incidence, a direction parallel to the plane of incidence and perpendicularly intersecting the central axis is defined as the X-axis direction, and a direction perpendicularly intersecting the plane of incidence is defined as the Y-axis direction, a direction of polarization beam separation by the polarization conversion element being the X-axis direction.