A discharge lamp drive device includes a discharge lamp driver adapted to supply a drive current to a discharge lamp having a first electrode and a second electrode, a control section adapted to control the discharge lamp driver, and a storage section adapted to store a plurality of drive patterns of the drive current. The control section is configured to select one drive pattern of the plurality of drive patterns based on machine learning, and execute the selected drive pattern. In a case in which a predetermined condition is fulfilled, the control section executes a predetermined drive pattern of the plurality of drive patterns without selecting and executing the drive pattern based on the machine learning.

A projector includes a light source, light modulation device, first driver, and second driver. The first driver is configured to drive the light modulation device to alternately provide a first polarity period and a second polarity period. The second driver is configured to drive the light source so that timings of switching related to a drive current coincide between the first polarity period and the second polarity period. The timings of switching are different from each other between a first period and a second period. The first period contains one first polarity period and one second polarity period adjacent to the one first polarity period. The second period is adjacent to the first period and contains another first polarity period than the one first polarity period and another second polarity period than the one second polarity period. The another second polarity period is adjacent to the another first polarity period.

A discharge lamp drive device includes a discharge lamp driver adapted to supply a drive current to a discharge lamp, a control section adapted to control the discharge lamp driver, and a storage section adapted to store a plurality of drive patterns of the drive current. Each of the drive patterns has a plurality of drive parameters. The plurality of drive patterns includes a first drive pattern and a second drive pattern different from each other in a value of at least one of the plurality of drive parameters. The control section is configured to execute the first drive pattern and the second drive pattern in accordance with at least one of accumulated lighting time of the discharge lamp and an individual of the discharge lamp in a case in which an inter-electrode voltage of the discharge lamp is at a predetermined voltage value.

A discharge lamp drive device includes a discharge lamp driver adapted to supply a drive current to a discharge lamp having a first electrode and a second electrode, a control section adapted to control the discharge lamp driver, and a storage section adapted to store a plurality of drive patterns of the drive current. Each of the plurality of drive patterns has a plurality of drive parameters. The control section executes at least three of the drive patterns in a case in which drive power to be supplied to the discharge lamp is in a predetermined power band, and in a case in which an inter-electrode voltage of the discharge lamp is a predetermined voltage value. Any two of the at least three drive patterns are different from each other in a value of at least one of the plurality of drive parameters.

A discharge lamp drive device includes a discharge lamp driver adapted to supply a drive current to a discharge lamp having a first electrode and a second electrode, a control section adapted to control the discharge lamp driver, and a storage section adapted to store a plurality of drive patterns of the drive current. The control section is adapted to select one drive pattern of the plurality of drive patterns based on machine learning, and execute the selected drive pattern.

To improve general versatility by being capable of using a different kind of light source as well as to improve the maintainability.

Included is an optical unit including an optical system including a modulator; a signal unit that sends a signal to the modulator; a light source block including a light source that emits light, a lens that allows the light emitted from the light source to enter the optical unit, and a case including the light source inside; a power source block for light source that supplies electric power to the light source; a power source unit that supplies electric power to the signal unit and the power source block for light source; and an outer casing in which the optical unit, the signal unit, the power source unit, the light source block, and the power source block for light source are arranged, and the light source block is replaceable with a different kind of light source block including a different kind of light source.

A projector according to the invention includes a discharge lamp, a cooling section, and a control section. The control section is configured to execute a first cooling control in which a number of revolutions of the cooling section does not depend on an inter-electrode voltage of the discharge lamp and a second cooling control for controlling the cooling section based on first control information indicating a relation between the inter-electrode voltage and the number of revolutions. The number of revolutions in the first cooling control is equal to or smaller than the number of revolutions in the second cooling control. When the inter-electrode voltage is larger than a first voltage value or when a cumulative lighting time of the discharge lamp is larger than a first time, the control section configured to switch the control of the cooling section from the first cooling control to the second cooling control.

A discharge lamp driver includes a discharge lamp drive unit, a control unit, and a voltage detection part. When an inter-electrode voltage is smaller than a first predetermined value, the control unit controls the discharge lamp drive unit to provide a mixed period in which a first period and a second period are alternately repeated and a third period alternately including a first direct-current period and a second direct-current period. A length of the first direct-current period is larger than a length of the second direct-current period. The length of the second direct-current period is smaller than 0.5 ms. A total of the lengths of the first direct-current periods in the third period is larger than a length of the second period. When the inter-electrode voltage is smaller than the first predetermined value, the control unit is configured to increase the length of the third period in a stepwise manner.

A discharge lamp includes a luminous tube and a pair of electrodes. At least one of the pair of electrodes includes a core material, a coil section in which a metal wire is wound on the core material in three or more layers, a distal end portion made of a conductor and provided, with respect to the coil section, at an end portion of the core material on a side where the other electrode is disposed, and a rear end portion made of a conductor and provided on the opposite side of the distal end portion with respect to the coil section. The rear end portion includes a first diameter section having a first diameter and a second diameter section having a second diameter smaller than the first diameter and present in a position farther from the coil section than the first diameter section.

A light integrating system includes an integrator rod, a triangular prism, and first and second light sources misaligned with each other. The integrator rod has a light-integrating axis, first and second light-entrance surfaces, a first reflection inclined surface and a first light-exit surface. The triangular prism adjacent to the second light-entrance surface has a third light-entrance surface, a second light-exit surface, and a second reflection inclined surface. Light of the first light source is incident into the integrator rod through the first light-entrance surface and is reflected by the first reflection inclined surface to emit out of the first light-exit surface along the light-integrating axis. Light of the second light source is incident into the triangular prism through the third light-entrance surface and is reflected by the second reflection inclined surface to emit out of the first light-exit surface through the second light-exit surface and the second light-entrance surface sequentially.