Disclosed is a digital pen that tracks the user's writing and provides useful feedback based on the user's writing. In one embodiment, the pen may provide feedback when the user has written a misspelled word, invalid mathematical expression, or any noncompliant expression. The pen may also provide feedback relating to the user's handwriting. The feedback may be visual, auditory, or tactile, and may be realtime or delayed. Statistics relating to the user's performance may be tracked, uploaded to external devices, and shared with others. This allows the user and interested parties to track the user's progress over time. The disclosed pen will be useful in educational settings.

Disclosed is a digital pen that tracks the user's writing and provides useful feedback based on the user's writing. In one embodiment, the pen may provide feedback when the user has written a misspelled word, invalid mathematical expression, or any noncompliant expression. The pen may also provide feedback relating to the user's handwriting. The feedback may be visual, auditory, or tactile, and may be realtime or delayed. Statistics relating to the user's performance may be tracked, uploaded to external devices, and shared with others. This allows the user and interested parties to track the user's progress over time. The disclosed pen will be useful in educational settings.

A writing device can be configured to provide ink or a colored dye upon a piece of paper or other medium. Such a writing device can include a plurality of separately extendable writing elements and a housing with a plurality of holes upon a terminal end of the housing, each hole providing a dedicated outlet hole for one of the writing elements, the housing comprising one of an elliptical cross section, a circular cross section, and a rounded off square cross section.

A lighting device for a hand tool contains: a base, an illumination unit, and a clamping mechanism. The illumination unit is disposed in the base which includes a lighting orifice and four projections, each two of which are arranged on each of two sides of a bottom end of the base, and between each two projections is defined a V-shaped groove. The clamping mechanism includes a retainer, a connection shaft, and a resilient element, wherein the retainer has a fitting portion, a positioning section, and a controlling section, and wherein the positioning section is placed on the bottom end of the base and is defined among the four projections, the controlling section extends out of one side of the base, and the resilient element is fitted on the connection shaft and has a first end abutting against the base and a second end contacting with the controlling section.

A lighting device for a hand tool contains: a base, an illumination unit, and a clamping mechanism. The illumination unit is disposed in the base which includes a lighting orifice and four projections, each two of which are arranged on each of two sides of a bottom end of the base, and between each two projections is defined a V-shaped groove. The clamping mechanism includes a retainer, a connection shaft, and a resilient element, wherein the retainer has a fitting portion, a positioning section, and a controlling section, and wherein the positioning section is placed on the bottom end of the base and is defined among the four projections, the controlling section extends out of one side of the base, and the resilient element is fitted on the connection shaft and has a first end abutting against the base and a second end contacting with the controlling section.

A writing instrument including a hollow cylindrical barrel with a first segment that is connected to a second segment, a tip located at a first longitudinal end of the barrel, a cap connected to the second segment that covers a second longitudinal end of the barrel and includes a clip, an ink cartridge, a battery, a light emitting device, a first actuator to extend and retract the writing end of the ink cartridge, and a second actuator to activate or deactivate the light emitting device. The light emitting device is located in the tip, at the end of the clip, or within the segmented barrel. The light is directed towards a writing surface based on proximity or directional lighting whereby the location of the light emitting device directs the light to the writing surface from the clip or down the length of the barrel.

A writing instrument including a hollow cylindrical barrel with a first segment that is connected to a second segment, a tip located at a first longitudinal end of the barrel, a cap connected to the second segment that covers a second longitudinal end of the barrel and includes a clip, an ink cartridge, a battery, a light emitting device, a first actuator to extend and retract the writing end of the ink cartridge, and a second actuator to activate or deactivate the light emitting device. The light emitting device is located in the tip, at the end of the clip, or within the segmented barrel. The light is directed towards a writing surface based on proximity or directional lighting whereby the location of the light emitting device directs the light to the writing surface from the clip or down the length of the barrel.

A writing device can be configured to provide ink or a colored dye upon a piece of paper or other medium. Such a writing device can include a plurality of selectable writing elements, wherein one of the writing elements comprises marker device comprising an ink reservoir connected to a writing tip.

A writing device can be configured to provide ink or a colored dye upon a piece of paper or other medium. Such a writing device can include a plurality of selectable writing elements, wherein one of the writing elements comprises marker device comprising an ink reservoir connected to a writing tip.

An electronic smart pen is disclosed that comprises a housing with a twist ring and a marker that is configured to be in an exposed state or in a retracted state. In the exposed state a tip of the marker is exposed from the housing, while the retracted state has the tip being enclosed by the housing. The smart pen also comprises an internal power switch that toggles the electronics of the smart pen between an on-state and an off-state. Rotating the twist ring provides a combined mechanism to move the marker from the retracted state to the exposed state, while also toggling the power switch from the off-state to the on-state so that the marker is automatically extended when the pen is turned on.