# Patent

## Title
Welding helmet with integral user interface

## Abstract

A welding helmet is capable of providing an image representative of information from an associated welding operation where the image appears in the same focal range as the welding work area.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation of and claims the benefit of U.S. application Ser. No. 12/577,824, filed Oct. 13, 2009, which is now issued as U.S. Pat. No. 8,569,655, granted Oct. 29, 2013.


TECHNICAL FIELD
This invention relates in general to equipment used in welding.
BACKGROUND
Welding is an important process in the manufacture and construction of various products and structures. Applications for welding are widespread and used throughout the world, for example, the construction and repair of ships, buildings, bridges, vehicles, and pipe lines, to name a few. Welding may performed in a variety of locations, such as in a factory with a fixed welding operation or on site with a portable welder.
In manual or semi-automated welding a user/operator (i.e. welder) directs welding equipment to make a weld. For example, in arc welding the welder may manually position a welding rod or welding wire and produce a heat generating arc at a weld location. In this type of welding the spacing of the electrode from the weld location is related to the arc produced and to the achievement of optimum melting/fusing of the base and welding rod or wire metals. The quality of such a weld is often directly dependent upon the skill of the welder.
Welders generally rely upon a variety of information when welding. This information includes, for example, current and voltage. Traditionally, welders would need to look at gauges on the control panel of the welding equipment to gain this information. This would require the welder to direct their field of vision away from the welding work area and as such was undesirable.
In the past, efforts have been made to provide welders with information during welding, such as in the method disclosed in U.S. Pat. No. 4,677,277, where current and voltage are monitored to produce an audio indication to the operator as to the condition of the arc in arc welding. However, monitors consisting only of audio arc parameter indicators are hard to hear and interpolate and are not capable of achieving the desired closeness of control and quality of weld often required.
More recently, as disclosed in U.S. Pat. No. 6,242,711, an apparatus for monitoring arc welding has been developed that provides a welder with real-time voltage and current conditions of the welding arc where information in the form of lights, illuminated bar graphs, light projections, illuminated see-through displays, or the like are placed within the visual range of the helmet wearing operator and located in proximity to the helmet viewing window in the helmet. However, in this apparatus a welder must still move their visual focus away from the welding work area in order to focus on the information located proximate to the welding window or the welder must accept the information peripherally while continuing to focus on the welding work area.
SUMMARY
This invention relates to a welding helmet that is capable of providing an image representative of information from an associated welding operation where the image appears in the same focal range as the welding work area.
Various aspects will become apparent to those skilled in the art from the following detailed description and the accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of a welding system according to the present invention.
FIG. 2 is an enlarged view of a welding helmet similar to the helmet of FIG. 1 including a camera.
FIG. 3 is a cross-sectional diagram of a welding helmet similar to the helmet of FIG. 2 including a projector.
FIG. 4 is a cross-sectional diagram of a welding helmet similar to the helmet of FIG. 3 including an integrated video display.
FIG. 5 is a perspective view of a welding helmet similar to the helmet of FIG. 2 including binocular cameras.
FIG. 6 is an interior view of a welding helmet similar to the helmet of FIG. 5 showing binocular viewing screens.



DETAILED DESCRIPTION
Referring now to the drawings, there is illustrated in FIG. 1 a welding system 10. The welding system 10 includes a welding helmet 12, a welding system 14, a welding gun 16 and a work piece 18. The work piece 18 generally defines a welding work are 20 where the welding gun 16 may be used to form a weld.
The welding system 14 includes welding equipment for generating a welding current and voltage, a welding control system for controlling the welding current and voltage, and a monitoring system for monitoring the welding current and voltage. The monitoring system may also monitor a variety of other operating parameter, such as but not limited to, wire feed speed, amount of wire used/amount of wire remaining, any type of welding feedback desired by the operator and any other desired operating parameter.
The welding helmet 12 includes a main body 22 with a visual display 24 connected to the main body 22. The display 24 may be a window including a welding lens, a video monitor, such as an LCD display or LED array, or any other device suitable to allow a welder to see the welding work area 20. It must be understood that in such an example where the display 24 is a video monitor video processing may be utilized to enhance the pictures of the welding operation. Further, recording devices may optionally be included to record and later playback welding operations for analysis and/or evaluation.
As best shown in FIG. 2, a welding helmet 12 may include a camera 26 mounted at or proximate to the point of view of the welder. In the example where the visual display 24 is a video monitor, the camera 26 may provide video pictures of the welding work area 20 to the display 24.
As shown in FIGS. 3 and 4 an information generating mechanism 28 is in communication with the monitoring system of the welding system 14 and capable of generating an image representative of information from the monitoring system based upon the a monitored welding parameter, such as current and voltage upon the visual display 24 where the focus of the image is at a focus range with an associated welding work area, e.g. outside of the main body 22 of the welding helmet 12. For example, the image may be symbolic, alpha-numeric, or any other device suitable to indicate the information. Thus, a welder may view an image representative of information about a welding operation without removing focus from the work area. Thus, in at least one embodiment the welder may focus on the work area and the image of information at the same time.
It must be understood that among other types of information, along with a variety of other parameter, the information based upon welding current and voltage includes, but is not limited to, welding current feedback, welding voltage feedback, control settings of the welding equipment, statistical information of the welding process, benchmarks or limits including capacity representations, alerts including material shortage or low flow, a representation of an intended or desired weld, etc.
Further, in one embodiment, the camera 26 is used to calibrate the depth of the image relative to the welding work area 20. In another embodiment, positions sensors on the welding gun may be used to calibrate the depth of the image. In particular applications it is highly desirable to carefully align the image and the welding work are such that the information represented in the image is easy for the welder to access and such that the information in the image is readily accepted by the welder.
In the example where the visual display 24 is a video monitor, information generating mechanism 28 may include an image representative of information from the monitoring system based upon the monitored parameter, such as welding current and voltage, in video pictures of the welding work area 20 shown on the display 24.
As indicated at 29, the information generating mechanism 28 may be in wired or wireless communication with other devices as desired.
In FIG. 3, the information generating mechanism 28 is a projector 28. The projector may, for example, include an internal LCD display or LED array 30 along with a number of associated mirrors 32 to reflect the image generated to the visual display 24. The reflected image gives the image the appearance of depth relative to the visual display 24 and thus puts the image at a focus range with an associated welding work area and outside of the main body 22 of the welding helmet 12 and optionally at the same focal distance as the associated welding work area 20. Optionally, a reflective surface 34 may be placed upon a portion of the visual display 24 in order to achieve a desired amount of reflection or reflection angle. In one embodiment, teleprompter type technology may be utilized to place the image upon the display 24 or surface 34. Additionally, it must be understood that one embodiment includes the use of an LCD display or other similar display within the helmet to generate the image which is then sent along an optical path, such as by reflection or fiber optics or any other suitable device to place the image display 24 or surface 34.
In FIG. 4, the information generating mechanism 28 includes a screen, film, or sheet 36 integrated into the visual display 24. The sheet 36 may be a semi-transparent LCD film, electro-optic film, or any other suitable medium for the information generating mechanism 28 to produce an image generated in the visual display 24. In one application, the information generating mechanism 28 may projecting a stereogram on the welding lens such that a welder's eyes will separately view the images to create the perception of depth and thus focus the image at a focus range with the associated welding work area 20 and outside of the main body 22 of the welding helmet 12.
There is shown in FIG. 5 a welding helmet 12 including binocular cameras 26a and 26b. As shown in FIG. 6, these cameras 26a and 26b correspond to binocular viewing screens 24a and 24b. An information generating mechanism may produce an image to be generated in either of the viewing screens 24a or 24b or both. In one embodiment, the cameras 26a and 26b are placed in alignment with the screens 24a and 24b except on opposite sides of the main body 22, thus giving the welder the view directly in front of them. Additionally, in the embodiment with binocular cameras 26a and 26b and binocular viewing screens 24a and 24b the perception of depth of filed is produced.
In any case, the image may be an overlay of text or graphics or video feedback. Additionally, it is contemplated that in at least one embodiment the system described above may be used in a remote welding situation, including but not limited to robotic welding or underwater welding.
While principles and modes of operation have been explained and illustrated with regard to particular embodiments, it must be understood, however, that this may be practiced otherwise than as specifically explained and illustrated without departing from its spirit or scope.

## Claims

1. A welding helmet comprising:
a main body portion;
a visual display portion connected to the main body portion, the visual display portion defining a viewing area; and
an information generating mechanism which generates an image on the visual display portion, said image being viewable during a welding operation, wherein a focus of the image is at a focus range associated to a work area of the welding operation.

2. The welding helmet of claim 1, wherein information displayed in the image includes at least one of a welding current, welding voltage, welding control parameter, welding equipment, statistical information, control settings, capacity representations, alerts, and a representation of a weld.

3. The welding helmet of claim 1 further comprising a camera adapted to view and record a welding operation in the work area, the camera being used to record a welding operation in the work area.

4. The welding helmet of claim 1, wherein the image includes an image of the welding operation.

5. The welding helmet of claim 1, wherein the visual display portion allows the welding operation to be viewed at least through at least a portion of the visual display portion.

6. The welding helmet of claim 1, wherein the information generating mechanism is a projector.

7. The welding helmet of claim 1, wherein the visual display portion includes at least one reflective surface.

8. The welding helmet of claim 1, wherein the visual display includes at least one mirror.

9. The welding helmet of claim 1, wherein the image generating mechanism includes at least one of a screen, a film, and a sheet integrated into the visual display portion.

10. The welding helmet of claim 9, wherein the film includes at least one of a semi-transparent LCD film and an electro-optic film.

11. The welding helmet of claim 1, wherein the information generating mechanism includes a stereo projection, including separate images adapted to create a perception of depth.

12. A welding helmet comprising:
a main body portion;
a visual display portion connected to the main body portion, the visual display portion defining a viewing area;
an information generating mechanism which generates an image on the visual display portion, said image being viewable during a welding operation, wherein a focus of the image is at a focus range associated to a work area of the welding operation; and
a camera adapted to view the work area, wherein the camera is connected to the visual display portion to calibrate a depth of the image relative to the work area.

13. A welding helmet comprising:
a main body portion;
a visual display portion connected to the main body portion, the visual display portion defining a viewing area;
an information generating mechanism which generates an image on the visual display portion, said image being viewable during a welding operation, wherein a focus of the image is at a focus range associated to a work area of the welding operation; and
a sensor located outside of said main body portion and in communication with said visual display portion to calibrate a depth of the image.